Flutter App for Android and iPhone devices that can record phone calls

The project is a Flutter app for Android and iPhone devices that can record phone calls. Key requirements: 1. The app should automatically record both incoming and outgoing phone calls when running in background and activated using an on/off button. 2. The recording must be done locally on the smartphone without any external involvement like dialing conference numbers, etc. 3. The files containing recorded calls must be saved locally including date, called number/calling number and direction of call (incoming/outgoing) in the file name. 4. It must be possible to display, edit filename and copy files to PC, Mac, Google drive, Dropbox, etc. 5. Integration with a standard flutter payment/ subscription service. It is assumed that [login to view URL], [login to view URL] or similar can be used. 6. We will need the option to wrap/include the described code in a Flutter app containing other functionality, if possible. The target is to have a mock up (Req. 1-3) within one week and have the project completed within 3-4 weeks.