curl --request POST \
  --url https://api.leanpay.fr/v1/public/clients/batch \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "clients": [
    {
      "name": "<string>",
      "externalId": "<string>"
    }
  ]
}
'

{
  "data": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "tenantId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "externalId": "<string>",
      "name": "<string>",
      "createdAt": "2023-11-07T05:31:56Z",
      "updatedAt": "2023-11-07T05:31:56Z"
    }
  ]
}