https://medium.com/@shahyashs145/introducing-gasless-uniswap-dd056a2355de

Matic: The same contract that got deployed on ganache did not on Matic. I used hackathon's discord to get help on the issue.

Biconomy: It was very easy to integrate into biconomy once I attended the workshop that was at the start. Also, I was not sure which standard to use. I asked for suggestions on discord and found a winner.