Which service to use to generate a stub response?

Question

API

Please tell me a service where you can specify a response (in xml format) with test data that the application under test will receive.
The task is to test integration with an external application, which is currently being developed.
Ideally, the testing process is as follows. In the config of the application under test, we specify the path to the desired service, in which the necessary response with test data is already saved. We start the test and analyze the result.

Answer 1

https://httpbin.org/