checkPretend method
Records a purchase on drip's pretend store, in the preview: item is
the upgrade's claim with its plan (monthly, yearly or once), an
unlock with none, or the credits with the pack's amount. Only the
preview's backend records it, as a test purchase that charges nothing;
a pretend subscription lasts its free trial, else one period, and
doesn't renew. The platform refuses it with purchaseNotVerified.
Implementation
Future<FFXPurchaseState> checkPretend({
required String item,
String? plan,
int? amount,
}) => _check({
'store': 'pretend',
'item': item,
'plan': plan,
'amount': ?amount,
});