Using Commission Junction's API to create a shopping comparison site can be a bit more complex than using Amazon's API, but it is definitely possible. To get started, you will need to obtain API access from Commission Junction and then use the appropriate API endpoints to query their database for product information and pricing data. Commission Junction provides detailed documentation and support resources for their API, so it may be helpful to review these resources or seek assistance from their support team if you are having difficulty getting started. Additionally, there are many online forums and communities where developers share tips and best practices for using Commission Junction's API, so it may be worth exploring these resources as well.