curl --request POST \
  --url https://ah-api.merge.dev/api/v1/registered-users \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "origin_user_id": "user1234",
  "origin_user_name": "Yash",
  "shared_credential_group": {
    "origin_company_id": "merge-1234",
    "origin_company_name": "Merge",
    "custom_groupings": {
      "department": "engineering"
    }
  },
  "user_type": "HUMAN"
}'

{
  "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": {
      "department": "engineering"
    }
  },
  "user_type": "HUMAN",
  "authenticated_connectors": [
    "linear",
    "jira",
    "slack"
  ],
  "is_test": false
}