hey can you end this item coz i already paid you in paypal! <--your sentence
Correction:
Hey! Can you end this item because I have already paid you via/by PayPal?
1- coz = because
2) I have already paid ........( present perfect tense)
3) PayPal <------- a payment method Use" via or by".
4) Can you .............? It is a question. Use" a question mark".
5) Say " Would you end this item.....?" ( more polite)
6) PayPal<---- Name
_____________________________________________
嗨!你可否結束這個 item (the thing, product),因為
我已經透過 PayPal把錢給了你?
Please note that 你可否結束這個 item (the thing,product) ( It may imply you should send me that thing( product).