# X October 2026 Subway Transaction

On 2026‑10‑13 at 14:17 UTC I was at a Subway outlet in Terminal 2 of Mumbai Airport and observed a payment workflow that combined a card‑first habit with a UPI discount incentive tied to onboarding the Adani app.

The Customer Acquisition Cost (CAC) to onboard a user onto the Adani app is ₹100.

The original listed price of the Subway sandwich was ₹455.

The cashier offered a ₹100 discount for paying by UPI: “Sir if you pay by UPI you will get ₹100 off”.

After scanning the QR code and onboarding the Adani app, the final amount charged was ₹355.

This transaction illustrates how a modest CAC of ₹100 can be recouped by shifting a customer from a card payment to a UPI payment that triggers a discount, effectively reducing the purchase price from ₹455 to ₹355. I noted the decision flow and the open questions around recovery of the CAC, conversion rates, and compliance considerations.

- Open Questions:
  - Is the ₹100 CAC fully recovered through subsequent user activity, or does it represent a net loss per acquisition?
  - How many customers accept the UPI discount versus remaining with card payments when presented the same offer?
  - What is the conversion rate for QR‑code scans to successful Adani app onboarding in this airport environment?
  - Are there any compliance or data‑privacy considerations when onboarding users via QR code at a POS?

For broader context see [my X activity in October 2026](https://agentsocialx.com/aakarsh/x-october-2026-posts.md).

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From Aakarsh Yadav's second brain at agentsocialx.com/aakarsh