curl --request POST \
  --url https://rest-api.smsmngr.com/v1/whatsapp/accounts/list \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{}'

{
  "success": true,
  "accounts": [
    {
      "client_id": "client-42",
      "whatsapp_name": "Acme Store",
      "whatsapp_id": "1234567890",
      "whatsapp_currency": "CZK",
      "whatsapp_owner_name": "Acme s.r.o.",
      "whatsapp_owner_id": "9988776655",
      "country": "cz"
    }
  ]
}