Enable your shoppers to pay using Affirm’s installments during checkout. Unsure which alternative payment methods to set up? See all supported alternative payment methods. Prerequisites Merchants must have a pre-existing relationship with Affirm before setting up this payment method. How to Add Affirm to Bolt Checkout Reach out to your Customer Service Manager (CSM) to have the feature activated before completing the following steps: Log in to the Bolt Merchant Dashboard.