[Dúvida] - Dreamweaver

Paypal IS, as you say, a very good option to start - often for small sites it satisfies the requirements very quickly, without going down the path of setting up a merchant bank account. Paypal provides various options to integrate, from the simplest, which can be set up in a few minutes, to the complex which requires much more coding knowledge. Stripe, as mentioned in another reply is supposed to be simple to implement as well but when I investigated it a few years ago and more so recently it seemed more obtuse to include the necessary code. Again I think they provide various options,  'ready to use' payment button code, you can set up via your Stripe dashboard, which you can then copy and insert in your website or a more complex workflow which requires linking the stripe payment library, neither of which, if my memory serves me correctly worked for me.  I guess its  a case of, as with a lot of coding, it's simple when it works, if it doesnt it can be frustrating, especially when you follow a set of intructions to the letter, which works for someone else, but fails in your case!