Identification of unique profile with Paypal IPN

I've got a question on Paypal's IPN. After creating subscription profile (recurring payment profile), the confirmation of type 'recurring_payment_profile_created' is received on IPN. After proceeding payment, the confirmation of type 'recurring_payment' is received on IPN. The question is how should I identify that the payment (recurring_payment) belongs to the unique(specific) profile.

T开发者_JAVA技巧hanks.

recurring_payment_id. This will be a recurring payment profile ID in the form of I-xxxxxxxx. This should be included in all recurring payment IPN posts.