To use Brex 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 Brex to query the data you need using the URLs you provide, for example: for example, you can use the HTTP Request node to create a new Brex expense by sending a POST request to the appropriate endpoint with the necessary data in the body. Similarly, you can retrieve a list of transactions by sending a GET request to the transactions endpoint, allowing you to analyze spending patterns. Additionally, you can update existing records by sending a PATCH request with updated information, ensuring your records stay current.