Looking to create a custom PayPal donate form like the one at https://www.battlefields.org/help-save-battlefields. On the PayPal site with the wizard for the donate button it doesn't allow more than 3 dollar amounts or custom fields like that. Assuming this is a custom implementation but not sure where to start. Do I need to store and process all the fields myself in a database, can I capture them and send with the PayPal API, or something else? Welcome any assistance!