Calling Other Services

Every call from the booking service to the payment provider needs the same four pieces.

An address, such as https://payments.example.com/charges, that differs between a laptop and production.
A request body written as JSON from a Java object.
A conversion of the JSON answer back into a Java object.
A plan for errors, because the provider can decline a card, be busy, or not answer at all.

Writing these by hand for each call repeats the same setup code many times. Spring offers two ways to declare them instead

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