toJson method
Converts the PayEngineField instance to a JSON map.
This method is useful for serializing the object for API communication.
Example:
final json = field.toJson();
print(json);
Implementation
Map<String, dynamic> toJson() => {
'name': name,
'type': type,
'placeholder': placeholder,
'pattern': pattern,
'isRequired': isRequired,
'keyboardType': keyboardType.value,
};