curl --request POST \
  --url http://localhost:6900/v1/customers/bulk \
  --header 'Content-Type: application/json' \
  --data '
{
  "environment_id": "<string>",
  "customers": [
    {
      "user_id": "<string>",
      "provider_id": "<string>",
      "external_id": "<string>",
      "email": "jsmith@example.com",
      "name": "<string>",
      "phone": "<string>",
      "metadata": {}
    }
  ]
}
'