where owner is the signer, base_erc20 will pass the ABI to the factory so he knows what functions you can call and what parameters there should be on functions

const Pancake_router = new ethers.Contract(pancake_router_address, pancake_router_abi, owner)
pancake_router = Pancake_router.attach(pancake_router_address);

with abi only

btw .attach i think it's optional, dunno why i have it there lol

Ye, you would've been fine w/o attach() here.

o well... it's more attached

👀