I appreciate that fiddler provides an easy way for our data scientists to work with external APIs used by various clients.
It's fairly intuitive if you're familiar with API frameworks like Angular or React native but there aren't any tutorials provided with it so learning curve can be high initially. If you want some more support from their team they could provide some documentation/tutorials as well which would help in getting started quickly without spending too much time on understanding concepts. We use fiddler internally to test out different integrations we build using third party SDKs.