Is it possible to launch this app using a custom URL?

Yes, you can launch the app using the following URL's:

• Launch the app normally: ContactsSyncGG://
• Launch the app and initiate a sync: ContactsSyncGG://sync
• Launch the app and initiate an auto sync: ContactsSyncGG://autosync

If using Contacts Sync Pro rather than Contacts Sync, replace "ContactsSyncGG://" with "ContactsSyncPro://"

This help article relates to the iPhone app called "Contacts Sync" which can be downloaded here:
https://apps.apple.com/us/app/contacts-sync-for-google-gmail/id454390333
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