Get exchange rate (NOT IMPLEMENTED)
NOTICE: Multi-currency support is NOT implemented in Arcus.
Returns HTTP 501 unless entities.settings.multi_currency_enabled is true.
Returns a single exchange rate record by ID. Includes from_currency, to_currency,
rate, effective_date, and source. Returns 404 if not found or not owned by the entity.
Requires settings:read scope.
Authorizations
API key issued per entity via Settings > Developers > API Keys.
Each key carries scopes (e.g. orders:read, products:write).
Bearer token format: Authorization: Bearer ark_live_ent_Test keys use ark_test_ent_. Both are issued per entity
via Settings > Developers > API Keys.
Path Parameters
Response
Exchange rate
The response is of type object.

