From April 2021, Afterpay had a card that is a contactless Mastercard so you need no integration into your point of sale.
Note your EFTPOS machine will need to accept Paywave Mastercard and I know Paywave is an extra expense.
To process, you will need to get Afterpay permission to become an Afterpay approved merchant.
If you are interested, you need to go here and provide details like your EFTPOS terminal details.
Once accepted which does not take long, then when you get an Afterpay transaction, your funds are settled like any other card payment.
Clients of ours doing this have reported that it is easy and straightforward to use and it is fulfilling a need for many consumers.