M4eTransactionMeta constructor
M4eTransactionMeta({@required String callbackUrl @required String purpose @required String data })
Implementation
factory M4eTransactionMeta({
@required String callbackUrl,
@required String purpose,
@required String data,
}) {
assert(callbackUrl != null,
'M4eTransactionMeta [callbackUrl] should not be null');
assert(purpose != null, 'M4eTransactionMeta [purpose] should not be null');
assert(data != null, 'M4eTransactionMeta [data] should not be null');
return M4eTransactionMeta._(callbackUrl, purpose, data);
}