TransactionMeta constructor
TransactionMeta({@required String callbackUrl @required String purpose @required String data })
Implementation
factory TransactionMeta({
@required String callbackUrl,
@required String purpose,
@required String data,
}) {
assert(callbackUrl != null,
'TransactionMeta [callbackUrl] should not be null');
assert(purpose != null, 'TransactionMeta [purpose] should not be null');
assert(data != null, 'TransactionMeta [data] should not be null');
return TransactionMeta._(callbackUrl, purpose, data);
}