there are no unconfirmed TX sent to this address 12EwrctykFoNtABjvoGMXUaLqDthEvYE5z
i would guess the wallet you are using isn't in sync with the rest of the network.
and thats why its saying "pending payment"
maybe you mean you sent a payment from this address to another address and that payemnt hasnt confirmed yet?
please post the address you sent the payment to.
^This. ATM, I don't see any pending/unconfirmed payments in your address, neither incoming nor outgoing. Which wallet are you using btw? Could you copy/paste the transaction ID of the payment which is showing pending in your wallet? Maybe it was removed or wasn't broadcasted in the first place.