> For the complete documentation index, see [llms.txt](https://ninjapay.gitbook.io/webupi-protocol/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ninjapay.gitbook.io/webupi-protocol/other/helpful-references.md).

# Helpful references

[UPI: Unified Payments Interface - Instant Mobile Payments | NPCI](https://www.npci.org.in/what-we-do/upi/product-overview)

[npm: web3](https://www.npmjs.com/package/web3)

[Welcome](https://www.webln.guide/introduction/readme)

[Bitcoin's Lightning Network, Simply Explained!](https://www.youtube.com/watch?v=rrr_zPmEiME)

[Lightning Network](https://lightning.network/)

[Just Enough Research by Erika Hall](https://abookapart.com/products/just-enough-research)

[7 Powers - by Hamilton Helmer](https://7powers.com/)

[WebUPI Guide (v1.0)](https://www.notion.so/WebUPI-Guide-v1-0-5cc252edc8444fc39039be34efb23647)