cancelSubscription method
Cancels the subscription. Parameter subscriptionId: The ID of the subscription
Parameter reason: The reason for the cancellation of a subscription.
Implementation
Future<void> cancelSubscription(String subscriptionId, String reason) async {
var url = _payPalHttpClient
.getUrl('/v1/billing/subscriptions/$subscriptionId/cancel');
var body = jsonEncode(Reason(reason).toJson());
await _payPalHttpClient.post(url, body: body);
}