MutationIsBillingProgramAvailableAndroidHandler typedef
MutationIsBillingProgramAvailableAndroidHandler =
Future<BillingProgramAvailabilityResultAndroid> Function(BillingProgramAndroid program)
Implementation
typedef MutationIsBillingProgramAvailableAndroidHandler = Future<BillingProgramAvailabilityResultAndroid> Function(BillingProgramAndroid program);