Javascript validation in Odoo Ecommerce Shopping Cart

Hi all, we need 2 validate somethings before a customer can make a purchase in our website. It's a B2B business the the important here is just it works. We need to add this validations: Validation through Javascript: * Minimum order total of 48 units (regardless of model and / or size) * Only accept orders in lots of 24 (several of 24: 48, 72, 96, 120 ...) * At least 6 units per product, regardless of size (variants) Example Valid: * 2 units of model AVELLANES size 23 * 2 units of the model AVELLANES size 24 * 2 units of model AVELLANES size 26 * 1 unit of model TRAMUNTANA size 23 * 17 units of the model TRAMUNTANA size 24 Not valid: * 1 unit of model AVELLANES size 23 * 23 units of the model TRAMUNTANA size 23 Results: Valid: * Enable purchase processing button Invalid: * Disable purchase button * Show another message in the upper banner in the following cases (we will already insert the message): * Total amount of items <48 * Total quantity != multiple of 24 * Number of units per model <6 I want the code installed and working. Please if you understand the requirements, type UNDERSTOOD on the first part of your proposal. I don't accept bots. Thanks