https://www.googleapis.com/auth/adwords
After login, I store in my database:
access_token
refresh_token
customer_id (from listAccessibleCustomers)
The user that logs in has admin role in the MCC.
3. API Requests (REST v21)
All requests are made with headers:
json
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Edit
{
"Authorization": "Bearer <user_access_token>",
"developer-token": "<mcc_dev_token>",
"login-customer-id": "<MCC ID or client account ID>",
"Content-Type": "application/json"
}
Example endpoint:
bash
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POST
https://googleads.googleapis.com/v21/customers/{client_customer_id}/campaignBudgets:mutate
4. Current Flow
Refresh token → Works fine, I get valid access tokens.
Create budget → Works fine, I get a valid budgetResourceName.
Create campaign (Performance Max) → Always fails.
Payload example:
json
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{
"operations": [{
"create": {
"name": "my-test-campaign",
"status": "PAUSED",
"advertisingChannelType": "PERFORMANCE_MAX",
"campaignBudget": "customers/{customerId}/campaignBudgets/123",
"maximizeConversions": {},
"startDate": "2025-08-22",
"endDate": "2025-12-31",
"containsEuPoliticalAdvertising":
"DOES_NOT_CONTAIN_EU_POLITICAL_ADVERTISING"
}
}]
}
5. Errors
Case A: login-customer-id = MCC ID
vbnet
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403 PERMISSION_DENIED
User doesn't have permission to access customer.
Note: If you're accessing a client customer, the manager's customer id must
be set in the 'login-customer-id' header.
Case B: login-customer-id = Client Account ID
bash
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403 PERMISSION_DENIED
errorCode: USER_PERMISSION_DENIED
The caller does not have permission
In both cases, I cannot create the campaign.
6. My Question
My developer token is linked to the MCC.
The OAuth’d user has admin access in the MCC.
I tried both with login-customer-id = MCC ID and client account ID.
Budgets can be created, but campaigns always fail.
What is the correct setup so I can successfully create a Performance Max
campaign in a client account under my MCC in sandbox/test mode?
Do I need to grant the OAuth user explicit admin access inside each client
account individually (not only in the MCC)?
Or is there another required step for test campaigns with red-label
accounts + test developer tokens?
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