You can withdraw your SeamPay wallet to a 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 Wallet icon in the menu bar
Tap purple "-" button
Select the bank account to withdraw to
Enter the amount you would like to withdraw
Withdrawals from your Wallet are processed within the same day (typically in around 30 mins).