Get cancellation management configuration

curl --request GET \
  --url https://www.myshop.com/apps/subscriptions/cp/api/cancellation-managements/{id}

{
  "shop": "<string>",
  "id": 123,
  "cancellationInstructionsText": "<string>",
  "cancellationReasonsJSON": "<string>",
  "pauseInstructionsText": "<string>",
  "pauseDurationCycle": 123,
  "enableDiscountEmail": true,
  "discountEmailAddress": "<string>",
  "pauseReasonsJSON": "<string>",
  "dynamicallyPauseCycleOnCancellation": true
}