Google Play now requires a publishing key when publishing Android apps. To find and access your key, we’ve put together step-by-step instructions for you.
Step-by-Step Instructions
1. Open the Google Play Console
2. Select Settings tab, followed by the API access tab
3. Click the Create Service Account button and follow the Google API Console link in the dialog
4. Click the Create Service account button at the top of the developer console screen
5. Provide a name for the service account
6. Click Select a role and choose Project > Service Account Actor
7. Check the Furnish a new private key checkbox
8. Select JSON as the Key type
9. Click Create to close the dialog
10. Make a note of the file name of the JSON file downloaded to your computer
11. Back on the Google Play developer console, click Done to close the dialog
12. Click on Grant Access for the newly added service account
13. Choose Release Manager from the Role dropdown
14. Click Add user to close the dialog