curl --request GET \
  --url https://ah-api.merge.dev/api/v1/registered-users \
  --header 'Authorization: <api-key>'

{
  "count": 123,
  "next": "https://ah-api.merge.dev/api/v1/registered-users/?page=2",
  "previous": null,
  "results": [
    {
      "id": "91b2b905-e866-40c8-8be2-efe53827a0aa",
      "origin_user_id": "user1234",
      "origin_user_name": "Yash",
      "shared_credential_group": {
        "origin_company_id": "merge-1234",
        "origin_company_name": "Merge",
        "custom_groupings": {}
      },
      "user_type": "HUMAN",
      "authenticated_connectors": [
        "linear",
        "jira",
        "slack"
      ]
    }
  ]
}