How to Create a Product ID on Google Play?
The In-App Purchases form is used to generate In-App Purchase products. It contains a Product ID field that must be filled. Use this field to specify the product identifier for your product. Follow the steps below to create a product identifier:
Step 1. Log in Google Play Developer Console
Step 2. Create New In-App-Purchase
Select the application for which you want to create In-app Products, then click on the In-app Products button in left hand side of the page, then click on the Add new product button to create an In-app Product.
Step 3. Select product type and input product ID
After clicking Add new product button, you will see the following interface. Please select Managed product type and enter the Product ID in that form.
Product ID is a string identifier that can only contain alphanumeric (A-Z,a-z,0-9), underscore (_), and period (.) characters. You can use any sequence of these characters for your identifier. However, we recommend that you use the reverse domain name style (for example, com.companyname.appname.productid) when creating your identifier.
Note: This Product ID should be input in iCreateApp. Please be sure to use the same string identifier on both iTunes Connect and Google Play.
Step 4. Enter Price
Please input Title and Description. Then enter price for your publcatiion. select Yes for Cleared for Sale item. Then enter the pricing and availability details for your publication.
After you fill out these fields present in that form and click on Save button. Finally click on Inactive button to select Active item to active it.