Comment by valzam

I keep hearing this but I don't quite understand what the alternative is? I get that maybe introducing interfaces within your own business domain CAN be overused but certainly any external depedency should be fronted by an interface so the rest of the code can be tested without spinning up test http servers, database containers etc. all over the place. It just feels like a really lightweight, simnple thing to have an interface for some API that you are calling. It also means you are less depedent on the concrete implementation of the API and don't leak types and behaviour from systems you don't control into your codebase