PayPal and Stripe charge transaction fees. Its appears Google Pay does not. Integrating a free payment /transaction service would be a significant value-add for TroopTrack. Please consider this option.
Have you looked into integrating Google Pay? They don’t charge users but do they charge the integrator? No fee services are always great, especially for scouting. Thanks.
I looked at Google Pay a long time ago and the API was a nightmare. I will take a second look soonish (summer would be a good time when things slow down).