If the tattoo you want is more than the spending limit that you have with INKPAY, you can pay the full amount on INKPAY and any amount over your spend limit is added on top of the 40% initial payment.
You will need to pay the initial 40% payment on the day when accepting your INKPAY job and then 3 x 20% repayments fortnightly or 6 x 10% repayments weekly, from the day of getting the tattoo.