I am submitting a request against the TrafficEstimatorService using the developer id of an account with "Test Accounts" Access level and client information for a test account. The script I am using is a very lightweight modification of the EstimateKeywordTraffic example from googleads-php-lib (
https://github.com/googleads/googleads-php-lib/blob/master/examples/AdWords/v201601/Optimization/EstimateKeywordTraffic.php).
I am hoping to see some dummy data so I can build an application around it, but instead I'm encountering:
<faultstring>[InternalApiError.UNEXPECTED_INTERNAL_API_ERROR @ com.google.ads.api.services.common.error.InternalApiError.<init>(InternalApiErro]</faultstring>
I've tried over the course of the afternoon, so it seems likely that I'm doing something wrong rather than encountering an actual error in the API.
If it's helpful information, when I try querying against a production account I receive QuotaCheckError.DEVELOPER_TOKEN_NOT_APPROVED (which is expected based on my access level). I'd be happy to pass along xml.