问题
I am trying to incorporate a member subscription on my website using the paypalrestsdk with python in a django application. I understand that I need to do the following:
- Set up a BillingPlan for each type of subscription (ie. a monthly plan for $10 a month and a yearly plan for $100 a month)
- Create a BillingAgreement, which (based on the user choice of billing plan) redirects the user to approve the agreement and which returns the agreement object which will give me the ability to access the plan information in order to update, suspend, reactivate the agreement.
- Finally, in order to get started, I need to execute the BillingAgreement. This is the part that confuses me. Do I execute the agreement each month (for my users who have agreed to monthly subscription) or do I execute the agreement one time in order to tell PayPal to automatically process the monthly payment? If the latter case is the answer then how would I know if a payment failed for some reason? (Or do I need to check every time the user logs in by retrieving their BillingAgreement and searching for transactions within a particular date range for that agreement to make sure they are up to date and none of them failed?)
I have looked at the PayPal developer docs as well as GitHub samples. I have also successfully written code to create and execute one-time payments using the sandbox and all seems to be working just fine. I am just confused by how the recurring payments in the REST api work - specifically see #3 above.
回答1:
You do not need to execute the billing agreement each month but only once to start the agreement i.e. tell PayPal to automatically process the monthly payment.
You can use the search for transactions feature to check that none of the payments of a user failed, but you might only need to do that at the start of every monthly payment cycle for a particular user. As opposed to everytime they log in. In the future, we will try to provide better notification mechanisms to inform the merchant that a payment on a billing agreement has failed/changed status.
来源：https://stackoverflow.com/questions/25727671/do-i-need-to-execute-my-paypal-billingagreement-one-time-only-or-every-time-the