Query the Google Ads API via curl + jq. Three credentials are needed:

$GOOGLE_ADS_TOKEN — the user's OAuth bearer (adwords scope) → Authorization: Bearer $GOOGLE_ADS_TOKEN
$GOOGLE_ADS_DEVELOPER_TOKEN — the platform's developer token (injected server-side) → header developer-token: $GOOGLE_ADS_DEVELOPER_TOKEN
login-customer-id — the manager (MCC) id under which calls are made; use the target customer id, or $GOOGLE_ADS_LOGIN_CUSTOMER_ID if set (digits only, no dashes).

API version: the base is https://googleads.googleapis.com/<vNN>. Google ships a new vNN every ~4 months and retires old ones — set VER to the current supported version (check developers.google.com/google-ads/api release notes); the example uses v18.

If $GOOGLE_ADS_DEVELOPER_TOKEN is empty, the connector isn't fully provisioned — say so rather than calling the API (it would 401/DEVELOPER_TOKEN_NOT_APPROVED).