請參以下Paypal的官方教程，登入您的paypal賬號進行設置：

Solution

Change your PayPal profile to allow for multiple payments per invoice ID. You need to make these changes through PayPal.

  1. Log in to your account at https://www.paypal.com.
  2. Click “Gear”icon > Account Setting (upper-right corner).
  3. Click "Payment preference" and update "Block payments".
  4. Under Block Accidental Payments, choose No, allow multiple payments per invoice ID.