# Introduction

HasGeek is pleased to present The 50p Payments Handbook, a compilation of articles from our blog with additional contributions from our partners and experts in the field.

For up-to-the-minute reading, please visit our blog, <https://blog.50p.in> and watch for events and meetups on <https://50p.in>

This handbook is supported by Instamojo and contains a sponsored interview with the founder of Instamojo. All views expressed in the handbook are the authors’ own. This handbook is continuously updated and revised. For a full list of changes, check out the [changelog](https://hasgeek.gitbook.io/50p-handbook/changelog).

You can always download this e-book for free in the format you want - [ePub](https://www.gitbook.com/download/epub/book/hasgeek/50p-handbook), [mobi](https://www.gitbook.com/download/mobi/book/hasgeek/50p-handbook) and [PDF](https://www.gitbook.com/download/pdf/book/hasgeek/50p-handbook).

## Table of contents

### UPI and the ecosystem

### [UPI ecosystem overview](https://hasgeek.gitbook.io/50p-handbook/upi-ecosystem-overview)

### [BharatQR](#bharatqr)

### [UPI–BharatQR integration](https://hasgeek.gitbook.io/50p-handbook/upi-bharat-qr-integration)

### [BBPS - How it works](https://hasgeek.gitbook.io/50p-handbook/bbps-how-it-works)

### [Aadhaar and payments](https://hasgeek.gitbook.io/50p-handbook/aadhaar-and-payments)

### [Payments on WhatsApp? Here's how it works.](https://hasgeek.gitbook.io/50p-handbook/payments-on-whatsapp-heres-how-it-works)

### Cards and Electronic payments

### [Samsung Pay](https://hasgeek.gitbook.io/50p-handbook/samsung-pay)

### [Contactless payments](https://hasgeek.gitbook.io/50p-handbook/contactless-payments)

### Blockchain and cryptocurrencies

### [Demystifying ICOs](https://hasgeek.gitbook.io/50p-handbook/demystifying-icos)

### Policy, regulations, and security

### [Security in FinTech](https://hasgeek.gitbook.io/50p-handbook/security-in-fintech)

### [Building a payment product in India](https://github.com/hasgeek/50p-handbook/tree/b72e213bacf08e40b1ba8a8d9f49ee5658c58beb/building-a-payment-product-in-india.md)

### [Thoughts on PayTech business models in India](#thoughts-on-paytech-business-models-in-india)

### [e-KYC workflows in FinTech and payment companies](#e-kyc-workflows-in-fintech-and-payment-companies)


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