The key should be in base64 format.
The key needs to be downloaded from Google console as a json, then needs to be encoded in base64 format.
Refer to this documentation for more info: https://apidocs.cloudhealthtech.com/#gcp-account_how-to-encode-a-json-private-key
Afterwards, the user needs to get the encoded key and copy it into the API call.
ex:
{
"cloudhealth_billing_account_id": "XXXXXXXXXXX",
"billing_account_service_account": "XXXXXXXXXXXXX.iam.gserviceaccount.com",
"billing_account_service_account_json_key": "data:application/json;base64, ewxxxxxxxxx
xxxxxxxxxxxxxxxewxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxZD"
}