Can you help me?

[Test Testoviy]

Hello, please tell me how I can request an API from the Google ADS service (google advertising), I'm trying to get an API in the format JSON, for the start, got all, but in the list of opieration got this message (when step 3  Configure request to API)
Available operations

Unfortunately no listed API operations were found for your access token.

When I make a request with my own link, I have this answer from OAuth 2.0 playgroung

(for example https://googleads.googleapis.com/v8/customers/999-999-9999/paymentsAccounts)

"error": {
    "status": "INVALID_ARGUMENT",
    "message": "Request contains an invalid argument.",
    "code": 400,
    "details": [
      {
        "errors": [
          {
            "errorCode": {
              "requestError": "DEVELOPER_TOKEN_PARAMETER_MISSING"
            },
            "message": "developer-token parameter is missing."
          }
        ],
        "@type": "type.googleapis.com/google.ads.googleads.v8.errors.GoogleAdsFailure",

Can you explain how it work,  because i can't undrestand what request should i make.