Check out our free service that helps you kick off with our API, it's repository with Postman collections that allows you to quickly replicate and test calls against our API with a set of pre-configured end points.
What is Postman?
Create and send any HTTP request against the JustGiving API using the awesome Postman request builder. Postman also encodes data for you, uploads files, and sends binary data. Postman is free to use and can be downloaded here