Java integration
curl \ -H "Authorization: Bearer $ACCESS_TOKEN" \ https://www.googleapis.com/adexchangebuyer/v1.4/accounts
curl \ -H "Authorization: Bearer $ACCESS_TOKEN" \ https://www.googleapis.com/adexchangebuyer/v1.4/creatives
curl \ -H "Authorization: Bearer $ACCESS_TOKEN" \ https://www.googleapis.com/adexchangebuyer/v1.4/billinginfo