Android : Paypal Preapproval API operation (Example needed)

Question

Is there any working example for PayPal preapproval API operation. I went through some tutorials,. But they are specifying some preapproval key for the transaction. How will we get this key?

Answer 1

if you talk about Preapproval API Operation then the preapproval key is something the OTHER party returns to uniquely identify the transaction - for example, in their Order table they might have uniqueidentifier PayPalPreapprovalKey = newguid() field specifically for this purpose (if Order is the entity of the transactions).

does it make sense?