To use Chargify 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 Chargify to query the data you need using the URLs you provide, for example: for example, to create a new customer in Chargify, you would configure the HTTP Request node with a POST method, set the URL to your Chargify customer's endpoint, and include the necessary JSON payload with customer details. Similarly, for updating a subscription, you would use the PATCH method with the appropriate URL and data payload. To retrieve data, such as subscription details, set up a GET request directed at the relevant Chargify endpoint.