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I am trying to replace get_contract with Tezos.get_entrypoint_opt I need to transfer FA1.2 tokens in Dex: https://github.com/madfish-solutions/quipuswap-core/blob/master/contracts/Dex.ligo#L21-L28

      operations := transaction(
         Transfer(Tezos.sender, this, tokenAmount), 
         0mutez, 
         case (Tezos.get_entrypoint_opt("%transfer", s.tokenAddress) : option(contract(x))) of Some(contr) -> contr
         | None -> (failwith("01"):contract(x))
         end
         ) # operations;

But the entrypoint isn't found during execution. Deployed contract: https://better-call.dev/carthagenet/KT1PB7PCFS3F71FT8fbRmYsYX3ex8W7X5Vcw I have used this approach before and it worked fine:

operations := transaction(Transfer(Tezos.sender, this, tokenAmount), 0mutez, (get_contract(s.tokenAddress): contract(tokenAction))) # operations;

Deployed contract: https://better-call.dev/carthagenet/KT1KSpx5NY7FkY9PFBGRbYbui36rEF6agVWr Could someone advise something?

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In LIGO entrypoint name corresponds to your router enum value types, not function names. So "Transfer" should start with uppercase letter.

In you case you should call it as follows: Tezos.get_entrypoint_opt("%Transfer", s.tokenAddress)

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