Gets a usage plan key of a given key identifier.
See https://www.paws-r-sdk.com/docs/apigateway_get_usage_plan_key/ for full documentation.
apigateway_get_usage_plan_key(usagePlanId, keyId)
[required] The Id of the UsagePlan resource representing the usage plan containing the to-be-retrieved UsagePlanKey resource representing a plan customer.
[required] The key Id of the to-be-retrieved UsagePlanKey resource representing a plan customer.