We've known for a while that WhatsApp has been prepping a built-in payment service for its users in India, and the beta version of the app is now showing the new payments interface. The feature plugs into the UPI (Unified Payments Interface) program that includes many of the country's most popular banking institutions.

Although not officially announced by the company yet, beta testers have noticed a payment option in the attachment menu between Document and Gallery. According to TechCrunch, iOS users have been able to make payments with the service already. Gizmo Times has tried this out on Android, but it shows a "Couldn't add bank account" error message (below right).

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