Try to call erc20 transfer method but got below error

paymaster accepted but recipient reverted in local view call to ‘relayCall()’: null stack:Error: paymaster accepted but recipient reverted in local view call to ‘relayCall()’: null

Make sure you have tokens minted in the address you are calling the transfer function from. This error basically means you have some error in the token contract side or sending the wrong parameters. Your opengsn implementantion should be correct. Just check for any possible errors like insufficient token balance.