curl --request POST \
  --url https://revstack.dev/v1/customers/bulk \
  --header 'Content-Type: application/json' \
  --data '
{
  "customers": [
    {
      "environmentId": "<string>",
      "userId": "<string>",
      "providerId": "<string>",
      "externalId": "<string>",
      "email": "jsmith@example.com",
      "name": "<string>",
      "phone": "<string>",
      "metadata": {}
    }
  ]
}
'

null