Invalid Product Identifier for In-app purchase

Question

I am trying test my app for in-app purchase feature. I created some products for In-app purchase from itunes connect. I created these products as non-consumable products. But when I try to purchase the in-app products from my app, the response is "Invalid Product Identifier". I have no clue what does this error means. Please note that I have not yet submitted the app for review. I want to do In-app purchase testing before submitting the app. Can anybody guide me in the right direction or resources. Thank you.

Answer 1

The issue is resolved after signing agreement for paid application. Once the agreement is signed, I am able to test purchasing through my test user account in sandbox environment without any problem.