Can you use Apple Pay later to pay bills online?

If you are approved for an Apple Pay Later loan, you can use it at any website or merchant that accepts Apple Pay.

You do not get a ‘card number’ you can use like a debit or credit card. You can only use with Apple Pay.

Apply for an Apple Pay Later loan and make a purchase - Apple Support

Only if the merchant accepts Apple Pay Later. See this link -->Apply for an Apple Pay Later loan and make a purchase - Apple Support

In the link is the following:

If you don't see the option to make a purchase using Apple Pay Later

You might not see the option to make a purchase using Apple Pay Later at checkout if:

• The merchant that you're shopping with doesn't support Apple Pay Later or isn't located in the U.S. 
• Your purchase contains items that are ineligible for financing.
• You're not located in the U.S., or you're in an unsupported U.S. state or territory. 
• You were approved for your first loan in Apple Wallet but didn't tap Add to Wallet before trying to make a purchase.

No. Here’s how Apple Pay Later works.