I am working on an application like eBay. The application has a cart page for customers, where they can see more than 1 unit. Items must be paid. Elements with CheckBoxes allow the user to select any element they want to pay (even multiples). Assuming there are 5 items, each of which has a certain value. There is also a button with the image "Checkout With PayPal". I want the client to click on the image buttons after checking some elements. Now they should go to the PayPal verification page with detailed information about these products, including their price and the like. In fact, the entire invoice should be sent to PayPal indicating the individual positions with their prices.
As soon as the user pays for all of these items, paypal should inform me of the return of ReturnURL and some fields confirming that they paid. I will modify the database.
Which API will really help me get the most out of PayPal? I am reading Express Checkout, it looks like what I am looking for, but not sure if this is really what I want.
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