If the merchant gets increased business due to Afterpay I don't see why not? I personally wouldn't use credit cards to pay for a jacket, I'm too stingy to pay interest on it, however, I wouldn't mind using Afterpay.
This also differentiates Afterpay from Payday lending, APT makes profit by charging the retailers, not the customers (unless they don't pay back in time).
APT Price at posting:
$15.16 Sentiment: Hold Disclosure: Held