To use Esendex integration in n8n, start by adding the HTTP Request node to your workflow canvas and authenticate it using a generic authentication method. Once connected, you can make custom API calls to Esendex to query the data you need using the URLs you provide, for example: for example, to send an SMS through Esendex, configure the HTTP Request node with the appropriate POST request to the Esendex API endpoint and include the necessary parameters like the message body and recipient number in the request body. Alternatively, if you need to update contact records, set up an HTTP PUT request to update the relevant resource by referencing its unique identifier. You can also retrieve message logs by using a GET request to the relevant endpoint, ensuring you include any required query parameters to filter your data effectively.