You can top-up your SeamPay wallet from your bank account through the SeamPay app:
If you haven't added a bank account to your wallet;
Tap the Wallet icon in the menu bar
Tap Add new account below Bank accounts
Select your bank from the list
Enter your account number
If you've already added a bank account;
Tap the Home icon in the menu bar
Tap green "+" button
Tap the Bank Account option
Select the account you'll like to top-up with
Enter the amount you would like to top-up and if successful, your deposit will appear instantly in your SeamPay wallet