1. Make Pricing Templates

- goto Setup->Pricing Templates

2. Create In-app Product

Goto App Detail->Monetize->Products->In-app Products

Then Create Product

3. Fill the data

- Make Sure Your Product ID is same as in the admin panel subscription plan

- Select price and set it price in the admin panel subscription plan

- then active the product

- set all data in the subscription plan 

4. Add Licensing Key in Android

Goto Monetization Setup->Licensing

Copy the key and paste in android