I am developing an application in PHP/MySQL that needs to automatically send WhatsApp messages to my customers. I have already registered my business on the Meta platform (WhatsApp Business) and obtained access to the Graph API. However, I am completely lost when navigating Meta's menus and settings. I do not know how to create and get message templates approved, nor how to structure the API calls to send: Simple messages (text + URL link), Messages with an image + URL link, Messages with a PDF attachment + URL link. Simple message All these messages will always contain a URL link (to redirect to a web page). I need assistance with: Validating the templates with Meta (creation, submission, approval) while ensuring compliance with their content policies. Generating the API calls (endpoints, methods, headers) and the corresponding JSON structures for each message type (text, image, PDF). Providing concrete examples that I can directly integrate into my PHP code, without having to delve into Meta's technical complexity myself. I would like the work to be delivered with clear documentation including: The approved templates, The API requests (curl or equivalent) with parameters, The JSON schemas for each use case, And possibly some guidance on handling the sending process in PHP (using cURL, for instance). I am available to give you access to my Meta Business account (via appropriate roles) and provide all necessary information (WhatsApp Business phone number, API identifiers, etc.). My goal is that, after this step is completed, I can focus solely on developing my application by simply calling the APIs you have prepared. Can you help me with this?