Processing subscr_signup and subscr_payment in paypal

[MSNaidu]

After complete verification of paypal ipn message, i need to process my own business logic based on transaction type, So i am confusing here, I don't know what to process, means subscr_signup or subscr_payment.

1. what if the two IPN's come at the same time, as it is happening in the Sandbox. In this case, I will not have the order information.

2. What if I ignore the subscr_payment, until I process completely subscr_signup. Then I process subscr_payment. In this case, what is the frequency at which paypal retries sending the subscr_payment. Is it retried every few seconds?

we decided that to process subscr_signup first, what if the subscr_signup don't come before subscr_payment, then we can't do any thing with the subscr_payment because this don't have any amount and period variables.

Please help me,

Regards,
MSNaidu

[Modee]

Basically you are setting up a recurring billing for subscriptions, correct?

subscr_signup is sent by PayPal only the first time user signs up for a subscription.

subscr_payment is sent every time the user pays, including at signup.