Welcome, Ygor! From Brazil, I’m guessing (based on the Portuguese above)?
FWIW, it looks like the code you presented is a small, incomplete example snippit that implements a hypothetical backend API that sends a simple text “form” over WhatsApp. Is that close to what you intended?
What to do now? I suggest you learn Python, so you know what your code is actually doing
(especially if it is going to be responsible for money and your mother’s welfare). There are plenty of great Python tutorials out there (and equally plenty of bad ones); for you as an absolute beginner I’d suggest LearnPython.org.
Keep in mind that building a web application in Python, especially one that handles money and payments, is quite a complicated affair that requires knowledge of a variety of intersecting disciplines—Python programming for the backend, JavaScript for the frontend, HTML for the layout, CSS for the styling, REST/HTTP for working with APIs, basic principles of security, and likely a framework that runs on top of all of this.
As far as Python projects go, I at least would consider building a production web application that your mother is going to rely on for her livelihood to be a pretty advanced topic, one that will take a substantial amount of learning and effort to get to, and is not something you’re going to be able to learn in a few weeks. Furthermore, once you start dealing with money and transactions, that opens up a whole other dimension of potential legal and financial liability and problems should you make a mistake in your code.
Realistically, you and your mom are likely better off not re-inventing the wheel and instead using an existing ecommerce platform for this that is free to use or low cost—there may be specific platforms tailored for your region and market. Where even a beginning Python knowledge could help, though, is in the area of scripting rather than a full app—e.g. automating repetitive or routine tasks, specific interaction with services, etc.
Best of luck!