Fintech — Case study

PayLnk — fintech, live in production.

Payment links that work inside the apps where small sellers already make sales — Instagram DMs, WhatsApp and bios — with money settling directly to the seller's own UPI ID.

ClientPayLnk
IndustryPayments / fintech
Timeline6 weeks to first release
Live atpaylnk.in
◆ UPI deep links◆ QR fallback◆ Payment state machine◆ Mobile-first web app
The problem

What was broken

Small sellers were collecting payments by sharing a screenshot of a UPI ID and waiting for a screenshot back. Buyers dropped off at the hand-off, sellers lost track of who had paid, and Instagram traffic had no clean way to convert into money.

Results

  • Works inside Instagram and WhatsApp browsers
  • Settles directly to the seller's UPI ID
  • QR fallback protects failed app hand-offs
  • Paid / pending / expired dashboard for sellers
What we built

Decisions that made the difference.

/01

Links that survive in-app browsers

We engineered a payment link that holds up inside Instagram's and WhatsApp's in-app browsers, so a seller pastes one URL into a bio or a DM and gets paid.

/02

QR fallback on every failure

If a native UPI app hand-off fails — wrong app, no app, dead intent — a scannable QR renders instantly so the sale is never lost to a technical dead end.

/03

Direct settlement, no wallet

Money moves straight to the seller's own UPI ID with no intermediate wallet, which keeps fees low and removes the trust question entirely.

/04

Payment state at a glance

Sellers see paid, pending and expired links in one screen instead of scrolling through chat history to reconcile.

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