How can I configure a webhook in Pact broker that ends up with athorization in the header like this:

{
  "uuid": "xxxxxxxxxxxxxxxxxxxxxxx",
  "description": "Trigger Azure DevOps pipeline on pact change",
  "enabled": true,
  "request": {
    "method": "POST",
    "url": "<https://dev.azure.com/xxxxxxx/xxxxxxx/_apis/build/builds?api-version=6.0>",
    "headers": {
      "Content-Type": "application/json",
      "Accept": "application/json",
      "Authorization": "Basic xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
    },
    "body": {
      "definition": {
        "id": 124
      },
      "sourceBranch": "refs/heads/xxxxxxxxxxxxxxxxxxx"
    }
  },
  "events": [
    {
      "name": "contract_content_changed"
    }
  ],
  "updatedAt": "2024-08-22T07:35:01+00:00",
  "createdAt": "2024-08-22T07:33:25+00:00"
}

Rather than with username/password properties configured like this:

{
  "uuid": "xxxxxxxxxxxxxxxxxxxxxxxxx",
  "description": "Trigger Azure DevOps pipeline on pact change",
  "enabled": true,
  "request": {
    "method": "POST",
    "url": "<https://dev.azure.com/xxxxxxxxxx/xxxxxxxxxxxx/_apis/build/builds?api-version=6.0>",
    "headers": {
      "Content-Type": "application/json"
    },
    "body": {
      "definition": {
        "id": 124
      },
      "sourceBranch": "refs/heads/xxxxxxxxxxxxxxxxxx"
    },
    "username": "xxxxxxxxxx",
    "password": "**********"
  },
  "events": [
    {
      "name": "contract_content_changed"
    }
  ],
  "updatedAt": "2024-08-22T07:38:46+00:00",
  "createdAt": "2024-08-21T17:09:42+00:00"
}

I'm asking this because I was successful with the former type of requests against Azure DevOps API but not with the latter type of requests.

Don't use the username/password options in the webhook and instead, manually add the authorisation header?

Not manually but via API request using pact CLI tool. Is it possible? Because using the Pactflow GUI it seems to be possible to configure a webhook that ends up with that Authorization property in the header but using the Pact Brokers API request to create or update a webhook that is sent by the docker based pact CLI tool, its not clear to me how to create a webhook like that. To be more clear I mean how to create/update a webhook with the Authorization part in the header using this pact tool:

docker pull pactfoundation/pact-cli:latest
docker run pactfoundation/pact-cli:latest pact-broker create-or-update-webhook <https://dev.azure.com/xxxxxxxx/xxxxxxxx/_apis/build/builds?api-version=7.0> --description "Trigger Build-Service-CIRS.API pipeline whenever ConsumerX to ProviderX pact changes" --request POST --header "Content-Type: application/json Authorization: Basic xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" --data '{"definition": {"id": 124}, "sourceBranch": "${pactbroker.consumerVersionBranch}", "parameters":  "{\"pact_url\":  \"${pactbroker.pactUrl}\"}"}' --consumer="ConsumerX" --provider="ProviderX" --user=Username:$AzureToken --contract-content-changed --broker-base-url=$PactBrokerBaseUrl --broker-username=$PactBrokerUsername --broker-password=$PactBrokerPassword --uuid=xxxxxxxxxxxxx

The command above for example creates a webhook like this for example:

...
   "headers": {
      "Content-Type": "application/json Authorization: Basic xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
    },
...

As opposed to a header like the following that I could successfully test against Azure DevOps API:

...
"headers": {
      "Content-Type": "application/json",
      "Accept": "application/json",
      "Authorization": "Basic xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
    }
...

But in the meantime this is no longer an issue for me, because I was successful to authenticate against Azure DevOps API with a webhook request looking like this:

{
  "uuid": "xxxxxxxxxxxxxxxxxxxxxxx",
  "description": "Trigger Providerx pipeline whenever ConusmerX to ProviderX pact changes",
  "consumer": {
    "name": "ConsumerX"
  },
  "provider": {
    "name": "ProviderX"
  },
  "enabled": true,
  "request": {
    "method": "POST",
    "url": "<https://dev.azure.com/xxxxxxx/xxxxxxx/_apis/build/builds?api-version=7.0>",
    "headers": {
      "Content-Type": "application/json"
    },
    "body": {
      "definition": {
        "id": 124
      },
      "sourceBranch": "${pactbroker.consumerVersionBranch}",
      "parameters": "{\"pact_url\":  \"${pactbroker.pactUrl}\"}"
    },
    "username": "Username",
    "password": "**********"
  },
  "events": [
    {
      "name": "contract_content_changed"
    }
  ],
  "createdAt": "2024-08-22T17:29:29+00:00"
}