Paypal is use for money Transfer Purpose. you can add your Account with Paypal or can add your Credit card or Debit card for Money Transfer Purpose. But many times when you Transfer Money from your Paypal Account to other person then Paypal show you internal server error. It mean your Transaction have not Completed. this error mostly come to due Server Problem. you can try Transaction After some time. But if you still Facing this error then you need to take some steps for solve this error. you need to Check your setting and need do some changes in setting , in this Article i will Guide you which Types you need change in your Setting and for resolve this issue, you can click on the contact page after login to your account and get the PayPal customer support to help you