toMap method
Converts PaymentIntentAttach to Map<String,dynamic>
Use to attach Payment Intent and returns a PaymentIntentAttachResponse object
https://developers.paymongo.com/docs/accepting-cards#3-send-card-information-to-paymongo
Implementation
Map<String, dynamic> toMap() {
return {
'payment_method': paymentMethod,
'client_key': clientKey,
'return_url': returnUrl,
};
}