How to use Affirm on Poshmark.com

1. Fill your cart When you’re ready to check out at Poshmark, just select Affirm as your payment method. Enter a few pieces of information and get a real-time decision. 2. Choose how to pay Select the payment schedule that works for you. 3. Make simple and easy payments Download the Affirm app or sign in at affirm.com to set up AutoPay or easily make payments for your Poshmark purchase.