Step #1:
Log into your checkbook.io account.
Step #2:
In the menu on the left, choose "Send Payment"

Step #3:

Fill out the payment information and locate the Direct Deposit button. Then click it.
Step #4:

When you see this window, enter the Routing Number that is associated with your bank. This is commonly available information that you will be able to find on the bank website in case you don’t already have it.
Then, under the “Account number” & “Confirm account number” prompts, enter the Account Number of the bank account that you would like the funds deposited into. Please take an additional step to ensure that your account number is accurately typed in.
Once you’re confident of the accuracy of the Account Number, proceed to "Account Type" and select one of the three options that indicate the nature of the bank account.

Once a selection is made, click “Confirm & Send Payment”
If you want to push funds instantly to a debit card and have the recipient's debit card information, click here.