How to allow customer to pay with credit or debit card with Paypal?

By enabling Guest Checkout within your PayPal account settings, buyers will have the option to check out using a debit or credit card without the need for a PayPal account login.

Before you can enable Guest Checkout in Express Checkout, you must meet the following requirements:

• Have a confirmed email address.
• Verify your PayPal account.
• Set PayPal Account Optional to On within your PayPal settings

 Enabling the PayPal Account Optional Setting

1. Click here to log in to your PayPal Account
2. Go to your Accounts settings (from the top-right drop down menu)
3. Look for Website payments in the "Products & Services" section of the right sidebar menu
4. Find Website preferences and click on "Update"
5. Select PayPal Account Optional