I'm using the Google API client library for PHP to create Google Surveys. I'm able to create surveys, but not start them. The error I receive is:
Array ( [0] => Array ( [domain] => global [reason] => BILLING_TRANSACTION_ERROR [message] => Billing Transaction Error: Current user is not configured for post-payment..
I've set up a billing account @ https://console.cloud.google.com/billing and see my project linked to the account, but am still getting this error.
Any help would be appreciated!