On payment methods: Venmo and Cash App can be deep-linked with the amount pre-filled — the payer taps once and the app opens ready to pay. Zelle has no cross-bank payment link, so it just shows the payee's Zelle phone/email for the payer to enter manually.

How reminders send: Email opens your own mail client, pre-filled. SMS/WhatsApp copy the message so you can paste it in one tap. Full auto-send on a schedule needs a small backend — ask me when you're ready to wire that up.