Affirm

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Buy Now Pay Later (BNPL)payment_processingaffirm.com

Affirm is the largest US-based buy now, pay later (BNPL) platform, embedding installment financing directly into merchant checkout flows via direct API, SDK, or pre-built platform plugins. Merchants pay a merchant discount rate (MDR) per transaction with no monthly or setup fees; consumers receive real-time credit decisions and pay 0–36% APR depending on plan and creditworthiness. The platform's Adaptive Checkout uses ML to dynamically surface the optimal payment option (Pay in 4 vs. monthly installments) per shopper to maximize approval rates and conversion.

Products

  • Affirm Installment Loansactive

    Core BNPL product offering monthly installment plans at 0–36% APR with real-time credit decisions integrated directly into merchant checkout.

  • Pay in 4active

    Zero-interest option splitting purchases into four biweekly payments at 0% APR over 8 weeks, available at participating merchants.

  • Adaptive Checkoutactive

    ML-driven checkout module that dynamically surfaces the optimal combination of Pay in 4 and monthly installment options side-by-side, tuned per shopper and purchase amount.

  • Affirm Cardactive

    Visa debit card issued by Evolve Bank & Trust or Stride Bank that lets consumers use Affirm installment financing anywhere Visa is accepted, online or in-store.

  • Affirm Money Accountactive

    FDIC-insured consumer deposit account held with Cross River Bank, offered as a companion banking product within the Affirm app.

  • Affirm for Business (B2B BNPL)active

    BNPL financing extended to small business buyers purchasing through participating B2B merchants, enabling net-terms-style flexibility at checkout.

Features

Adaptive Checkoutpaid onlyReal-time AI Underwriting (account balance + cash flow signals)all plansWebhook Integrationall plansFive Integration Methods (direct API, SDK, platform plugins, wallet, in-store)all plansMerchant BusinessHub Portalall plansAPR Calculator for Merchantsall plansPromotional Messaging Customizationall plansOmnichannel Support (online + in-store POS)all plansApple Pay / Google Pay Wallet Integrationall plansShared Payment Tokens for AI Agent Commerce (Stripe partnership)paid only