To use Marketing Master IO 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 Marketing Master IO to query the data you need using the URLs you provide, for example: to further leverage Marketing Master IO in n8n, you can set up operations such as creating a new contact by sending a POST request to the appropriate endpoint with the necessary data in the body. For updating existing records, utilize the HTTP Request node with a PATCH method, while ensuring you include the correct record ID in the URL. To retrieve campaign data, simply execute a GET request to the campaign endpoint, allowing you to visualize or analyze the performance metrics directly within your n8n workflow.