Before you can launch your Subscription or In-App purchases, make sure these important steps are completed.
Start off by logging into your Apple Developer account and then head onto App Store Connect.
You'll then have access to several different tiles. Select Agreements, Tax & Banking.
Next, make sure that the fields in all 4 tabs are filled out. Agreements, Tax, Banking & Contacts. You may need to accept some terms before being able to complete these sections.
Now you've organised your Apple Developer account, log in to your Google Play Console.
On the left hand side you will see Settings - click here.
Next, click on Account details which will bring up your developer profile.
Then scroll down until you see Merchant Account, and follow the steps to set your account up as a merchant.
Voila! You're all done!