Has anyone tried to add liquidity into sushiswap on quickswap on Polygon mumbai testnet? because i cant event get fake funds and add liquidity on mumbai testnet. I wanna launch my contracts on polygon testnet for now. Let me know if anyone experienced that 
I just need LP token address so i can follow the particular LP token that user will be providing and I’ll be rewarding him/her for that
I also tried to use several UniswapV2Router02 deployed on mumbai and can’t even getAmountsOut from paths [WETH, USDT].
After having tried several addresses, I saw this post on reddit : https://www.reddit.com/r/0xPolygon/comments/nze8i3/quickswap_on_mumbai_testnet/
I concluded that no swap router is currently available on mumbai (maybe because of test MATIC distribution faucet limitations ?)
In this case i think its good to test on ethereum test net and then just deploy to polygon or bsc
You can also just copy the sushiswap contract and deploy it on the testnet. Then you deploy some copies of the tokens you want to use and add them to the liquidity pool. I do this when I test my contracts in truffle, just make simplified copies of all the contracts I’m going to interact with.