Question: how to send money to yourself with apple pay?
Answer: Go to your card info: iPhone: Open the Wallet app, tap your Apple Cash card, then tap . ... 
Tap Add Money.
Enter an amount. The minimum is $10.
Tap Add, then confirm the U.S. debit or prepaid card2 that you want to use to add money. ... 
Confirm with Face ID, Touch ID, or passcode.