This expands the domain of the exercise endpoint to accept interface IDs
instead of template IDs when exercising by contract ID. The argument is
still [compatibly] called templateId; interface IDs are accepted nowhere
else.
CHANGELOG_BEGIN
- [JSON API] Supports interface choices, including exercise by contract
ID accompanied by an interface ID.
See `issue #13301 <https://github.com/digital-asset/daml/pull/13301>`__.
CHANGELOG_END
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