Php checkbox filled validation jobs

Looking for a proficient researcher to provide comprehensive research services e.g., market trends, c... industry insights. The ideal candidate will have a knack for gathering and analyzing data, attention to detail, and the ability to deliver accurate and timely reports. Strong communication skills and the capability to present findings in a clear and concise manner are essential. If you have a proven track record in delivering high-quality research, we'd love to hear from you! Requirement; 1. Filled Verification form with Sign and Stamp along with verifier details. 2. 5-6 geotagged photos in which name board of Issuing Authority is visible. 3. In-case of refusal, I need written refusal statement with Sign and Stamp along with detail of person i.e. name, designation, email an...

I'm seeking an experienced React developer to rectify a couple of bugs in my application. The issues include: - Navigation errors - Form validation inconsistencies Benchmarks for this job: - Prior React knowledge - Debugging abilities - Experience in handling similar technical issues Please discuss your relevant React debugging experience when you apply. The task should be completed within a week's time. Can't wait to hear from you all! Don't bid if your budget is mor than $20 and start your bid with "React bug".

I am in need of a talented PHP developer with solid experience in integrating SMTP email with Outlook. The project's main objective is to enhance our mailing system, making it more user-friendly and effective. Key Project Requirements: - Implementing the ability to send email notifications from our system through Outlook. - Enabling tracking of email delivery status, ensuring transparency in our communication process. - Developing a user-friendly way to manage email templates, specifically focusing on basic text formatting like bold or italics. Ideal Skills and Experience: - Proficiency in PHP development. - Prior experience with integrating SMTP email, particularly using Outlook. - Strong understanding of email delivery tracking. - Ability to create a simplistic yet ...

I'm looking for an experienced PHP developer to help me create a dynamic and functional website. While I haven't clarified the project details such as the purpose and design preferences, I would ideally like the following: - User registration and login system - Online payment integration - CMS for easy content management Your experience working on similar projects and with PHP is essential. Please bid if you are confident in your ability to deliver a high-quality, dynamic website meeting these criteria.

I'm seeking a creative graphic designer to craft a modern-style promotional design set for my product, comprising of an editable PSD for: a poster, three varied flyers, Gift Certificate, a banner, a roller banner. Colour preferences: to match the files I'm attaching. Gold, black, white are the main ones. You are to leave clear spaces to be filled with photos in the future i.e an empty circle etc. I would like the following features to remain unchanged from the example file: 1. location and format of contact info on the bottom of the flyers/banners etc to be consistent with icons & font 2. style - circles etc. List of items and sizes: 1. Flyers (3 designs- Wedding. Children, Adults) : 148 x 210 mm -A5 size 3. Banner size & orientation -horizontal, 52 x 91 c...

I need an experienced PHP developer to help with customizing a PHP script. The specific details of the modifications are: - User Authentication: Implement an effective user authentication system. - Database Integration: Ensure seamless integration with our existing database. - UI/UX Enhancements: Enhance the user interface and user experience of the script. Please note that the specific PHP script has not been disclosed, and further details regarding the script's functionalities have not been provided. The successful freelancer will need to be able to navigate and modify PHP scripts efficiently and have a good understanding of user authentication, database integration, and UI/UX principles. Your expertise in PHP and familiarity with various scrip...

I'm in immediate need of an expert on Identity and Access Management (IAM) configuration and validation. Specifically, the project involves: - Forgerock Identity Cloud configuration and validation - PingOne Advance Cloud configuration and validation - Azure AD configuration and validation Furthermore, I need assistance with various IAM protocols and technologies including but not limited to: - SAML (Security Assertion Markup Language) - OIDC (OpenID Connect) - Federation Additionally, the ideal freelancer should be capable of troubleshooting during outages plus be proficient in Postman API Call Testing and Validation. Experience of the above is a must, given the urgency of the project. Please only bid if you are able to begin immediately and...

I'm in search of an experienced data entry specialist to assist in filling out more than 200 online forms. Key Responsibilities: - Filling out online forms with accuracy and efficiency. - Ensuring that all fields are correctly and completely filled out. Ideal Skills: - Proficiency in data entry and online form filling. - Attention to detail to ensure accuracy. - Excellent time management skills to handle a large volume of forms. - Experience in completing similar tasks will be a plus. Looking for someone who can deliver quality work within an agreed timeline. Please provide any relevant experience or examples of similar projects you have completed.

...for 1, 3, and 7 days ahead. The key deliverable is 3 dynamic dashboards that display this forecast in real-time. Key Points to Note: - **Programming Language**: Python - **Time Series Forecasting**: The freelancer is expected to have a solid understanding of time series forecasting methods. The deliverables should include 2 Neural Network and 2 autoregressive models (ARIMA, SARIMA etc…). The validation should demonstrate each model performance. - **Dynamic Dashboard**: I'm looking for a dashboard that's dynamic and interactive. It should display the forecast for the Twitter data using a visually appealing interface. - **Real-time Data Updates**: The dashboard should be capable of updating in real-time to reflect any changes in the forecast. The ideal freelancer...

Hi Encoder IT Limited, I noticed your profile and would like to offer you my project. We can discuss any details over chat.

Tasked with migrating our existing PHP/Apache project files and DB database from our live server to a new vendor server. This positions requires: - Working hands-on with Unix servers - Strong understanding of PHP 7.0, the version currently utilized on our live server - Familiarity with Apache 2.4, the version currently running on our live server - Capable of accurately inputting database credentials - Ensuring the project is fully functional on both web and mobile platforms Ideal candidate will exhibit expertise in server administration, specifically Unix. Familiarity with PHP 7.0 and Apache 2.4 is required. Knowledge of databases, particularly inputting credentials, is appreciated. Experience in ensuring cross-platform functionality on web and mobile applications is...

I ...Libya. The role requires: Key tasks include: - Confirming the authenticity of specific employment certificate at Giroush Center Of Chiropractic in Tripoli. - Verifying the accuracy of contract dates and job positions mentioned in the employment contract and get the Verification Form filled, signed and stamped by the HR. The following requirements are mandatory: 1- Task is to visit the address physically. 2- Take 5 to 6 Geo-Tagged Photos of Name Board and Building with Surroundings. 3- Get the Verification Form filled, signed and stamped by the HR. 4- In case of refusal to fill form, take the written refusal with stamp or sign as a proof. Get the details of Verifier, Name, Designation, Department and Contact. If the above mentioned requirements are fulfilled than task w...

Need a meticulous tester for my recently developed web app. Your primary role will include examining my web app modules specifically: 1. User registration and login 2. Payment processing 3. Data input and validation 4. Points and memberships 5. Timesheet and task management 6. Subscription This opportunity could lead to future testing projects if successful. As part of your application, please share references of your past work to provide insight into your QA testing experience and skills. Will need you to focus on all severity levels in bug reporting, ensuring the app functions effectively. Advanced experience in QA testing and bug reporting will be beneficial for this role.

First, please note that I don't do business with low-ballers. This document contains all of the details of the project. I went over it extensively with the assistance of Gemini AI to make sure it was complete and thorough. So if you plan to place a low-ball price in order to get me...customer information Adding and managing garden spaces Viewing and editing estimate details The developer will add functionality for: Capturing an image for each garden space Triggering email sending functionality 8. Security Considerations: The developer should implement security measures throughout the application: Secure storage of SMTP server credentials within a bundled configuration. Input validation for user-entered data (e.g., email address). Sanitize user input to prevent potential inj...

I need an Excel expert to overhaul my current worksheet. Key needs include formula adjustments, data validation updates, and creating an interactive dashboard. The dashboard should boast the ability for graphical data representation, specifically bar charts, and customizable filters to view data from multiple perspectives. The right candidate will have extensive experience in Excel, knowledge of advanced formulas, data validation techniques and be proficient in creating interactive dashboards.

Following are the requirements of task to be fulfilled. 1- Task is to visit the Clinic physically and Take 5 to 6 geotagged photos of with name board captured and from outside the building. 2- Get the verification form filled, signed and stamped by the HR of clinic, and also stamp the certificate. 3- Get the details of verifier, Name, Designation, Department and Contact. 4- In case of refusal to fill form, take the written refusal with stamp or sign as a proof. 5- If Clinic, does not found on given address than take the 7 to 8 geotagged photos of exact address with right left name boards photos and make a small few seconds video of address . Also get the details of any nearby business ( Name of person, Business name and Contact

Lo... industry insights. The ideal candidate will have a knack for gathering and analyzing data, attention to detail, and the ability to deliver accurate and timely reports. Strong communication skills and the capability to present findings in a clear and concise manner are essential. If you have a proven track record in delivering high-quality research, we'd love to hear from you! Requirement; 1. Filled Verification form with Sign and Stamp along with verifier details. 2. 5-6 geotagged photos in which name board of Issuing Authority is visible. 3. In-case of refusal, I need written refusal statement with Sign and Stamp along with detail of person i.e. name, designation, email and phone number. Please get in touch with me with your relevant experience and how you can help wit...

I'm looking for a data engineer with solid Pyspark knowledge to assist in developing a robust data storage and retrieval system, primarily focusing on a Data Warehouse. Key Responsibilities: - Implementing efficient data storage solutions for long-term retention and retrieval - Ensuring data quality and validation procedures are in place - Advising on real-time data processing capabilities Ideal Candidate: - Proficient in Pyspark with hands-on experience in data storage and retrieval projects - Familiar with Data Warehousing concepts and best practices - Able to recommend and implement appropriate real-time processing solutions - Strong attention to detail and commitment to data quality. Specifically, I have a Jira ticket that consists of creating an application that runs ...

...introduction about yourself. Job Description: We are seeking a proactive and adaptable Personal Assistant to join our vibrant team, offering crucial support to our CEO across a myriad of administrative tasks. This New Delhi-based position encompasses a substantial remote work component (80%), with a select set of responsibilities requiring travel within Delhi (20%). Embark on a rewarding journey filled with professional challenges and personal interactions, ensuring a unique and fulfilling work experience each day. Job Responsibilities: • Undertaking research initiatives on various subjects for the CEO, collecting, analyzing, and summarizing data and trends to furnish accurate and comprehensive information, facilitating informed decision-making. • Cross-diverse functi...

...templates tailored to Indian laws. 2. Asset Management: Tools to inventory and track assets, including property, investments, and businesses, facilitating efficient asset transfer. 3. Document Storage: Secure cloud storage for storing important documents such as wills, property deeds, and insurance policies. 4. Legal Assistance: Integration with legal resources and experts to provide guidance and validation throughout the will creation process. 5. Awareness & Education: Educational resources to increase awareness about the importance of will creation and succession planning in India. By providing a user-friendly platform and addressing common barriers to will creation, EstateEase aims to empower individuals to take control of their legacy and ensure the smooth transfer of as...

...Knowledge For Front End You can create it using Nextjs For the backend side, Express Create a responsive form website layout that adjusts seamlessly across various devices. (Web, Tab, Phone), and explain how would you approach designing a layout that maintains consistency and usability across different screen sizes, from desktops to smartphones? Create a validation in each form field please create a minimal 6 field (Plus point if the validation from back end side). For example: Name should contain the alphabet, not a number. (If it’s number show error message) The phone number contains a number. Etc. (you can create your field & own rules) * Create a reusable component. Add CSS animations to enhance user experience. Design and create an API to provide above...

I need a custom WhatsApp script built in PHP. The script will quickly send messages to the numbers in my database list. The script should: - Interface with my database to access numbers. - Be efficient and scalable for reaching a large number of contacts. Ideal skills and experience for this job: - Proficient in PHP, with experience in building similar WhatsApp scripts. - Familiarity with database connectivity in PHP. - Understanding of WhatsApp API and message sending limitations. - Prior experience in handling bulk messaging. Please note that the script should adhere to all WhatsApp's terms of service, including message limitations and privacy regulations.

Looking ... industry insights. The ideal candidate will have a knack for gathering and analyzing data, attention to detail, and the ability to deliver accurate and timely reports. Strong communication skills and the capability to present findings in a clear and concise manner are essential. If you have a proven track record in delivering high-quality research, we'd love to hear from you! Requirement; 1. Filled Verification form with Sign and Stamp along with verifier details. 2. 5-6 geotagged photos in which name board of Issuing Authority is visible. 3. In-case of refusal, I need written refusal statement with Sign and Stamp along with detail of person i.e. name, designation, email and phone number. Previous experience in market, competitive or consumer research would also b...

I'm in search of a highly proficient WP PHP developer who can skillfully handle custom coding for product lines, focusing on the following: - Fix broken links: Specifically, the broken links on product pages and in navigation menus. - Modify existing functionality: This includes adding new features, updating existing ones and removal of unnecessary ones. - Improve performance: Optimization and tweaks as necessary to boost the overall performance. Ideal candidates will have extensive experience in WP PHP, understanding of linking strategies, and a knack for improving site functionality and efficiency. A comprehensive understanding of custom coding is paramount.

I am seeking an experienced Linux/LAMP/PHP developer/sysadmin to update my PHP version from 7.2.34 on an AWS Amazon Linux 2 instance. You need to ensuring the smooth operation of my application, which majorly involves database operations, but I will do the checking. Main Requirements: - Update PHP version from 7.2.34 to a newer stable version at least 7.4. Desired Skills and Experience: - Extensive experience with PHP - Proven track record of updating PHP versions on live applications. Please include proof of similar past work in your proposals.

I have a data transcription and cleaning/validation project that requires a skilled individual. All data will be provided in Excel and PDF formats. Key Responsibilities: - Transcribing data accurately from multiple sources - Cleaning and validating the data to ensure accuracy - Working primarily within Microsoft Excel Skills/Experience Required: - Proficiency in data entry, transcription, and data cleaning - Strong command over Microsoft Excel - Attention to detail and accuracy are key I am looking for a detail-oriented individual with relevant experience to help me complete this task efficiently and accurately. Please include examples of similar projects you have completed in your proposal.

I have a simple PHP Guestbook script with a flat file Db. I need someone to add more entries in the posting form, see my example attachment. Including making the necessary changes and validations in the script for these new entries. Please make necessary adjustments in Admin Panel to reflect these new added entries, as needbe. Also, I would like the post results (Current Entries) displayed on a separate landing page. Not on the same page that is below the posting form. Please test out script on your own server.... Thank you

My Magento 2 website hosted on a CentOS 7 server with cPanel is experiencing a sudden increase in the number of PHP-FPM processes it's using, despite no updates or modifications to the server. This issue is affecting the site's performance and stability. Key Project Details: - I am not aware of any recent surge in website traffic that could explain this sudden spike in PHP-FPM processes. - The problem lies in the custom extensions I'm using on the Magento 2 platform. Required Skills and Experience: - Expertise in Magento 2 is essential, as the issue seems to be rooted within the platform. - Previous experience in troubleshooting PHP-FPM process overloads is highly preferred. - Familiarity with CentOS 7 and cPanel is a plus, to ensure a comprehensive u...

As a busy individual managing both pers...personal and business contacts to my database. - Ensuring the entry of crucial information: specifically, the name and phone number for each contact. To accomplish this task smoothly and efficiently, the following skills and experiences will be beneficial: - Proven experience with data entry tasks, specifically involving contacts management. - Expertise in database management, data input, and validation. - Detail-oriented and meticulous approach to handle large volumes of data. - Familiarity with digital tools for document scanning. - Proactive communication to clarify any ambiguities in source data. This project is your chance to leverage your precise data management skills while helping to improve my contact organization. Interested? L...

Hi Zubair Ali S., I noticed your profile and would like to offer you my project. We can discuss any details over chat.

Project Deadline: 1 Hour Project Type: PHP Project Level: Standard PHP Type: 8.2 & Above Number of Bugs: 1 Project Overview: Our current PHP script submits a request to the OpenAI API & the Replicate API to retrieve their AI output. We have noticed that the “topic” value is not being successfully submitted with the request. All other form data is submitting fine We would like this fixed. 5* FEEDBACK WILL BE LEFT FOR YOU

...transforming them into attractive, market-ready content that highlights the unique features and benefits of each service. CSV File Enhancement and Completion: Beyond basic data entry and content creation, the project involves enriching the CSV file with additional required information such as categories, tags, applicable taxes, and more. All fields mandated by Square for the upload must be meticulously filled out to ensure compatibility and functionality. Uploading and Formatting for Square: The CSV file must be formatted precisely to meet Square's specifications. This includes verifying the format, aligning the data correctly, and ensuring that the upload process will proceed without errors. Skills and Qualifications: Proven Experience in Data Management: Extensive backgro...

I need an experienced PHP developer with a solid understanding of Stripe's payment platform. This project's main objective is to develop a script that sends a post request to Stripe for over-capturing an authorized payment. The over-capture is performed to modify payment details, specifically the amount billed due to additional charges accrued. Expertise in handling Stripe’s transactional operations and PHP post request handling is necessary. Skills Required: - Proficiency in PHP - Extensive experience with Stripe API - Familiarity with financial transaction processes - Strong problem-solving abilities

I need an experienced PHP developer to help with customizing a PHP script. The specific details of the modifications are: - User Authentication: Implement an effective user authentication system. - Database Integration: Ensure seamless integration with our existing database. - UI/UX Enhancements: Enhance the user interface and user experience of the script. Please note that the specific PHP script has not been disclosed, and further details regarding the script's functionalities have not been provided. The successful freelancer will need to be able to navigate and modify PHP scripts efficiently and have a good understanding of user authentication, database integration, and UI/UX principles. Your expertise in PHP and familiarity with various scrip...

...implement robust logging to capture any future issues related to Facebook login for prompt resolution. Testing and Validation: Rigorously test the updated Facebook login functionality across various iOS devices and environments to ensure reliability and compatibility. Documentation and Reporting: Document all changes made to the Facebook login implementation and provide a comprehensive report outlining the issues addressed and the solutions implemented. Deliverables: Updated iOS app with fixed Facebook login functionality. Documentation detailing the changes made and any relevant insights gained during the troubleshooting process. Test reports demonstrating the successful validation of the Facebook login fixes across different scenarios. Timeline: The project is expected...

...skilled professional to help with the maintenance of my websites built with core PHP and MySQL. Key Tasks: - Website changes: Regular content updates and design changes are anticipated, so the candidate should have flexibility and be comfortable with changes. - Feature Additions: I'm looking to extend the functionality of the websites, so the candidate should be able to implement new features. - Bug fixes: It's essential for the candidate to have a keen eye for identifying and fixing bugs that may arise within the websites. - Security updates: The candidate should be able to stay up-to-date with the latest security trends and ensure the websites are secure. - Performance optimization: A deep understanding of PHP and MySQL is required to optimize the performance...

I noticed you posted a following project ( https://www.freelancer.com/projects/php/Age-Validation-Check-Page-Development/details )

...the age of individuals. Key Requirements: - The check-in page should capture the user's CPF (Brazilian taxpayer ID) and Date of Birth. - If a user is of legal age, the check-in should be approved and data stored in the backend. The project is divided into two main areas: - Front End: - The front end should be user-friendly and have a smooth check-in process. - It should include an age validation feature that cross-references the user's date of birth with the legal age limits. - Back End: - The backend should collect and store specific data about the user, including their name, CPF, date of birth, and the time of check-in. - This data should be easily accessible for administrative purposes. Successful freelancers should have: - Demonstrable experience in we...

Seeking an experienced video creator and editor for my YouTube channel specializing in real estate information. The focus of the videos will be on: - Buying tips - Selling tips - Market trends Essentially, the freelancer will be creating instructional content filled with actionable insights that viewers can readily apply. Each video should be 5 minutes to 10 minutes long, concise and engaging. Ideal candidates will possess: - In-depth knowledge of real estate industry trends - Proven experience in creating and editing short, informative videos - Strong understanding of YouTube content creation and audience engagement - Ability to convert complex information into digestible content. If you can take on this challenge, please place your bid.

I need a form created on my WordPress website that can be filled out from the front-end by users. This form should then display the submitted values in a table. Key Requirements: - Create a form with standard fields like Name, Email, Message, and Phone Number. - Ensure the form is user-friendly, accessible, and responsive. - Develop a backend that can handle the form submissions and display the values in a table. - The table should be dynamic, updating in real-time as new submissions are made. Ideal Skills: - Proficient in WordPress, including custom post types and advanced custom fields. - Experience with front-end development and user interface design. - Knowledge of back-end development, particularly in handling form submissions and data storage. - Familiarity with integrating...

App Version 1.6 Laravel Version 7.30.6 PHP Version 7.4.33 Extension IonCube Loader is installed License code "To handle the Codegyan scripts. This was a prepaid version with multiple restaurants. This website is only for the orders that roll. As I checked, the speed is slow due to the JavaScript library not working properly. We need to update HTML for all three panels: user, restaurants, driver. Do you want to integrate new HTML? I need to remove the Livewire from my website. Delete all files not important for the website and logically structure all pages of the files. The website will only be used for delivery. Everything else must be deleted. Current version." musst be updated to the new version

I'm looking for a skilled PHP developer to create a web system primarily focused on data analysis. The system will serve as a platform for users to perform detailed data analysis. Key features to include: - User Registration and Login: The system should have a secure user registration and login functionality to keep the data protected. - Various Search Modules: I would like the system to have search capabilities by name, date, and category. This will allow users to slice and dice through data effectively. Ideal skills and experience: - Proficiency in PHP: As the core technology of this project, you should have a strong background in PHP. - Data Analysis Expertise: Experience in building systems that cater to data analysis will be a huge plus. - Security Knowled...

I'm in need of an innovative freelancer for the design of an air rifle incorporating an airsoft gas tank within the stock build. The key objective for this tank integration is to improve overall performance by enhancing the shooting range and firing speed of the weapon. The gas tank will be filled with green gas. In addition, modifications to the rifle should also include alterations to the magazine. Familiarity with gun design principles, an understanding of the properties and applications of green gas and experience with similar design projects would be a plus. Key Deliverables: - Integration of an airsoft gas tank into rifle design - Upgraded magazine design - Improve overall weapon performance. Your creative vision, practical insight, and innovation will all be valuab...

Hello I have a web app that im building for my customers. ...customers. And I already hired someone to setup the sign up page.. All you have to do is add the google sign up and finish setting up the backend for the setting pages. I also added notes to my prototype design explaning each feature. React JS is used for the front end. And the PHP Laravel was used to start this project. I would like to pay $150 - 200 for this project. If the work goes well then I will use your services to finish building the rest of the features. Im also building a software company here in america so for the right person i can provide work for years!!! I would like to hire someone today.

...Expertise in Laravel: The developer should have strong proficiency in Laravel framework and HTMl to seamlessly integrate the PhonePe callback URL into the existing backend infrastructure. PhonePe Integration Experience: Prior experience in integrating PhonePe payment gateway or similar third-party payment systems is highly preferred. Familiarity with handling transaction callbacks and response validation is essential. API Integration Skills: The developer should be well-versed in working with APIs and implementing callback mechanisms to process transaction notifications from PhonePe securely. Security and Error Handling: Ensuring secure handling of sensitive transaction data and implementing robust error handling mechanisms to manage edge cases and ensure smooth operation of the ...

I need the online / offline sync to work seamlessly. We have a react native app using mongodb realm. There was an instance where a few records where created and then after pressing home those records vanished. They weren't synced to mongodb and where no longer present in the app. There is no delete functionality in the app. There is a function which checks for online status using neti...shows the realm connection status and the network connection status. At the time of this error it was reported the indicator which shows realm is connected was flashing both offline and online rapidly which may be the cause of what happened. i think the issue resides in Providers > RealmSubscriptionProvider Instructions yarn to install then yarn android to spin up dev env, api key will be pre ...

I'm in need of an expert with skills in HTML and JavaScript to optimize a script for my personal website. The site is dedicated to a 'Programming Languages' mobile assignment and currently, it requires an upgrade. Requirements: - Profound knowledge of HTML and JavaScript and php - Must be capable of form validation - Understand how to implement interactive animations - Experience in data visualization is a plus Your role in this project will be to ensure the site runs flawlessly while maintaining clean and efficient scripting. I want to appeal to users with a seamless navigational experience and this is where your expertise comes in. Please bid if you are able to bring these requirements to life and let's give this website the upgrade it needs.

I am looking for a proficient python developer to help in enhancing a Telegram PHP bot. With your skills and experience in bot programming, I am confident we can have this bot become even better. As part of this project, you need to: 1. Customize Bot Commands: - Add new commands as per the specific requirements I will share. 2. Change Chatbot Responses: - Modify existing responses in a way that improves the user engagement. - Delete some responses that are no longer relevant. 3. Integrate Third-Party APIs: - This integration will help the bot offer more utilities and functionalities. The ideal candidate for this project should have extensive knowledge in Telegram bot development, PHP, Python, and experience in third-party API integration. I look forward t...

Please Sign Up or Login to see details.

Hi Freelancers, (URGENT) : need this Today ! I have a codecanyon script, please check it here : I need to use whatsapp only, don't need SMS feature, I have a VPS without control panel and I want to install it and make whatsapp works without any problem. Thanks Amine