To make a deposit using Apple Pay, you must use a macOS or iOS device.
If you're using any other device, Apple Pay won't be available as a payment option.
To deposit funds with Apple Pay, please navigate to My Account →Transactions → Deposit, and follow the provided steps:
Select Apple Pay.
Ensure that you have added a payment method to your Apple Wallet.
Enter the amount and select Deposit.
Click the Apple Pay button to proceed.
Authenticate and complete your payment using Touch ID, Face ID, or your passcode, following the on-screen instructions.
You can find more information on deposit limits here.