Hi,
In reviewing your requirements I found myself eligible to help you with the fixing of your website issues (paypal and invoice layout).
I am a full stack web developer having 9 years of experience. I have developed from simple static sites to eCommerce solutions. My expertise includes PHP, PHP based CMS's (Joomla, Wordpress etc.), frameworks (Yii, Laravel etc.), AngularJs, ReactJs, NodeJs, MySql and MongoDB.
I look forward to hearing from you.
Thanks.