In this post, you’ll learn about the Google Play API Error NONCE_IS_NOT_BASE64 and the reason why you are receiving the error message and how to fix it
How does this Google Play Message Look like?
NONCE_IS_NOT_BASE64
Why do you receive this Error in the Google Play Integrity API?
Nonce is not of base64 web-safe no-wrap form.
How to fix this error?
Retry with correct nonce format.