You could create production manager account (MCC) and apply for developer token. When you apply for developer token, it will have pending approval status. Once the developer token is approved then you could make production AdWords API call. However, you could make the API call to your test AdWords account with developer token with pending approval status. You cannot
link a test manager account or a test AdWords account with a production manager account, or vice versa. Please check out our
Test account guide for creating the test manager account and test AdWords account. Please check out
getting started guide.
Umesh, AdWords API Team.