Buy Now Pay Later Software Development

Off-the-shelf BNPL platforms work well when your product matches their loan data model. Custom becomes the right call when your credit decisioning logic, your merchant integration requirements, your instalment plan structure, or your regulatory obligations are specific enough that a standard platform's configuration layer can't model them cleanly.

We build BNPL platforms for fintech founders launching a standalone BNPL product, for retailers embedding pay-later at checkout, and for embedded finance companies whose BNPL offering is part of a broader financial product suite. The credit decisioning rules, the affordability assessment approach, and the merchant integration model are specified during discovery before any code is written.

  • Real-time credit decisioning engine with credit bureau integration, FICO score lookup, and configurable affordability rules applied at checkout

  • Instalment plan management with repayment scheduling, payment collection, and borrower-facing account portal

  • Merchant checkout integration via iframe, hosted payment page, API, or white-label SDK

  • Delinquency management with collections workflow, forbearance handling, and arrears reporting

RaftLabs builds custom buy now pay later software for fintech founders, retailers, and embedded finance companies who need real-time credit decisioning at checkout, instalment plan management, merchant checkout integration via iframe, API, or SDK, delinquency management and collections workflows, BNPL compliance tooling for affordability checks and regulatory obligations under FCA, TILA, and CFPB rules, and a BNPL analytics dashboard across their merchant and borrower portfolio. Most BNPL software projects deliver in 12 to 16 weeks at a fixed, agreed cost.

Recognition

Sound familiar?

  • Real-time credit decisions at checkout taking too long because your underwriting relies on manual review rather than an automated decisioning engine applied at the point of sale?

  • Instalment plan data fragmented across merchants because each integration is handled separately with no single view of the borrower's repayment status?

  • Affordability checks and BNPL regulatory obligations, FCA rules, TILA, CFPB guidance, not built into your decisioning flow and handled instead as a post-hoc compliance exercise?

Companies we've built for

Vodafone
Nike
Microsoft
Cisco
T-Mobile
Aldi
Heineken
GE
Software products shipped
100+
Cost delivery
Fixed
Week delivery cycles
12-16
Industries served
24+

When the decisioning logic needs to be the product, not the workaround

Most BNPL technology problems do not start at the merchant integration layer. Presenting a pay-later option at checkout is the part any capable development team can build. The problem is what happens in the milliseconds between the consumer clicking "pay later" and the decision returning to the screen, applying the lender's credit policy automatically, pulling a credit bureau file and a FICO score in real time, running the affordability assessment against the borrower's committed expenditure, and returning an approve or decline before the consumer's patience runs out. These are credit risk and systems performance problems, and the platform has to encode the BNPL operator's credit policy in a way that is fast, auditable, and consistent with the affordability obligations that FCA rules, TILA disclosure requirements, and CFPB guidance impose on instalment credit.

We build BNPL platforms for fintech founders whose underwriting model is too specific for a standard BNPL SaaS platform's rules configurator, for retailers who need a white-label pay-later product embedded natively into their checkout rather than a redirect to a third-party provider, and for embedded finance companies whose BNPL product sits alongside other credit products and shares borrower identity, affordability data, and credit bureau integration with the rest of the platform. The decisioning logic, the affordability model, the instalment plan structure, and the merchant integration approach are all specified during discovery before development begins.

What we build

  1. Real-time credit decisioning engine

    Credit decisioning engine executing the BNPL operator's credit policy against each checkout application, the credit score threshold, the maximum instalment commitment relative to assessed income, the minimum credit bureau history requirement, and any merchant-specific or product-specific eligibility criteria, and returning an automated approve or decline within the latency window that checkout UX demands. Credit bureau integration pulling the applicant's credit file from Experian, Equifax, or TransUnion at the point of application, with the bureau data fields mapped to the decision engine's input variables and the response cached for the session to avoid repeat bureau hits on the same applicant within the same shopping session. FICO score integration retrieving the applicant's FICO score alongside the bureau file, with the score applied to the automated decisioning threshold or used to set the approved instalment limit within a configured range. Soft search at pre-qualification running a soft credit check during the browsing session before the consumer commits to the pay-later option, returning an indicative eligibility result without leaving a footprint on the credit file, with the hard search deferred to the point of confirmed purchase. Decision audit trail recording the input data, the bureau data used, the credit policy rules applied, and the decision produced for every application, the documentation required for FCA responsible lending evidence, TILA disclosure compliance, and CFPB examination readiness.

  2. Instalment payment management

    Instalment plan generation producing the full repayment schedule at the point of purchase approval, the instalment amounts, the due dates, the interest component where applicable, and the total cost of credit disclosed in line with TILA or FCA pre-contractual information requirements, with the schedule stored against the loan record and presented to the borrower through their account portal. Payment collection processing each instalment on the due date by direct debit, card-on-file charge, or bank transfer depending on the product's collection method, with the payment posted to the loan ledger and the outstanding balance updated in real time. Borrower account portal giving the consumer a view of their active instalment plans across all merchants, the plan balance, the next payment date and amount, the payment history, and the early settlement option, with the portal accessible via web and mobile. Early settlement allowing borrowers to repay an instalment plan in full before the final due date, with the settlement amount calculated from the outstanding balance under the product's settlement terms and the settlement confirmed to the borrower before payment is collected. Repayment schedule amendment for borrowers who request a payment date change within the product's permitted amendment window, with the revised schedule recalculated and the borrower notified of the updated due dates.

  3. Merchant checkout integration

    Hosted payment page integration allowing merchants to redirect the consumer to the BNPL operator's hosted checkout at the point of payment selection, with the order value, the merchant reference, and the approved instalment options passed from the merchant's cart, and the consumer returned to the merchant's confirmation page on completion. Iframe integration embedding the BNPL checkout flow directly into the merchant's own checkout page without a redirect, with the iframe communicating the decisioning result and the payment confirmation back to the merchant's page via a postMessage event. API integration for merchants with the technical capability to build their own checkout UI, providing a REST API for submitting applications, retrieving decisioning results, confirming purchases, and querying repayment status, with webhook callbacks for asynchronous events. White-label SDK for mobile applications, wrapping the checkout API in a native SDK for iOS and Android that the merchant's mobile development team can drop into their app without building the API integration from scratch. Merchant onboarding and configuration portal allowing the BNPL operator to onboard new merchants, configure the approved instalment options per merchant, set merchant-specific credit policy overlays, and manage the API credentials and webhook endpoints for each merchant integration.

  4. Delinquency management and collections

    Payment failure detection triggering on a failed instalment collection attempt on the due date, updating the plan's arrears status, and initiating the configured delinquency workflow, re-presenting the payment, notifying the borrower through the configured channel, and escalating to the collections team if the account remains unpaid after the re-presentation window. Arrears staging moving each delinquent plan through the arrears stages defined in the product, from the first failed instalment through the stage threshold that triggers formal collections action, with the transition recording the days past due, the arrears amount, and the collections action taken. Forbearance handling for borrowers in financial difficulty, recording the forbearance arrangement, a payment deferral, a reduced instalment, or an extended plan term, against the loan record and generating the revised repayment schedule from the arrangement date. Collections team workflow assigning delinquent accounts to collections agents with the borrower's account history, the arrears amount, the previous contact attempts, and the recommended next action presented at the point of assignment, with the agent's actions and outcomes recorded against the account. Regulatory reporting on arrears and forbearance for FCA-regulated BNPL operators, producing the data required for regulatory returns in the required format and at the required frequency.

  5. BNPL compliance tooling

    Affordability assessment building the income and expenditure assessment into the decisioning flow rather than as a separate manual process, pulling open banking transaction data where the product uses an open banking affordability check, calculating the borrower's committed monthly expenditure including existing instalment obligations, and applying the affordability test defined in the credit policy before the decisioning engine returns a result. PSD2-compliant open banking connection for affordability assessments in UK and EU markets, requesting the borrower's consent to share their bank transaction history through the FCA or EBA-regulated open banking connection and processing the transaction categorisation within the decisioning flow. TILA disclosure generation for US BNPL products, producing the required pre-contractual disclosures, the annual percentage rate, the total amount of payments, the payment schedule, in the format and at the timing required by the Truth in Lending Act, stored against the loan record as the compliance evidence. CFPB examination readiness building the data retention and audit trail structure required for CFPB supervision of BNPL products, including the credit decision records, the affordability assessment evidence, the disclosure documents, and the collections contact records. Regulatory change management providing a configuration layer for the credit policy rules and affordability thresholds so that the compliance team can update the decisioning parameters when regulatory guidance changes without requiring a development release.

  6. BNPL analytics dashboard

    Portfolio overview showing the live state of the BNPL book, the total outstanding instalment balance, the number of active plans, the average instalment value, the arrears rate by days-past-due bucket, and the expected collections over the next 30 and 60 days, updated from the live loan data rather than from a periodic batch report. Merchant performance reporting showing originations, average order value, approval rate, default rate, and outstanding balance by merchant, with the data filterable by time period and exportable for merchant account management. Credit performance analytics tracking the decisioning outcomes over time, approval rate, decline rate, referral rate, and the distribution of accepted applications by credit score band and affordability assessment outcome, giving the credit risk team the data needed to assess whether the credit policy is performing as expected. Vintage analysis showing the repayment performance of each loan cohort, the origination month, the arrears development by days past due, the cumulative default rate, and the recovery rate, so the credit risk team can identify whether performance is deteriorating for recent cohorts before it reaches the portfolio-level metrics. Affordability assessment monitoring tracking the outcomes of the affordability assessment component of the decisioning flow, the proportion of applications declined on affordability grounds, the distribution of assessed debt-to-income ratios, and the correlation between assessed affordability and subsequent repayment performance, to support ongoing credit policy calibration.

Frequently asked questions

Standard BNPL platforms work well when your instalment product, your credit decisioning logic, and your merchant integration requirements match the platform's standard configuration options. Custom becomes the right choice when your credit policy requires decisioning rules the platform's engine can't configure, when your affordability assessment approach, using open banking data or a proprietary income model, can't be integrated into the platform's decisioning flow, when your merchant integration needs a white-label experience the platform's hosted checkout doesn't support, or when your regulatory obligations under FCA rules, TILA, or CFPB guidance require a data structure and audit trail the platform's reporting module doesn't produce. We'll tell you honestly during discovery if a configured platform covers the requirement.

We integrate with Experian, Equifax, and TransUnion through their decisioning APIs, pulling the credit file and FICO score at the point of application and mapping the bureau data fields to the input variables of the decisioning engine. The specific fields pulled, score, delinquency history, open credit commitments, instalment obligations, are configured during discovery based on the credit policy's requirements. For BNPL operators using a proprietary scorecard alongside bureau data, we integrate the scorecard model as a component of the decisioning engine and combine the scorecard output with the rules-based policy checks to produce the final decision.

Affordability assessment requirements vary by market. In the UK, FCA rules require BNPL operators to assess whether the credit is affordable for the specific borrower before approving it. In the US, CFPB guidance on BNPL and TILA disclosure requirements apply to instalment credit products. We build the affordability assessment directly into the decisioning flow rather than as a post-decisioning manual check, pulling open banking transaction data for UK products using a PSD2-compliant connection, calculating committed monthly expenditure including existing instalment obligations, and applying the affordability test before the engine returns an approve or decline. The assessment inputs and outputs are retained as the regulatory evidence record.

We build four integration types depending on the merchant's technical capability and UX requirements: a hosted payment page for merchants who want a redirect-based integration with minimal development effort; an iframe integration for merchants who want the BNPL flow embedded within their checkout without a redirect; a REST API integration for merchants who want to build their own checkout UI using our decisioning and plan management APIs; and a native iOS and Android SDK for merchants with mobile apps. Most BNPL platforms support two or three of these options to cover the range of merchant technical capabilities in their network.

A BNPL platform covering real-time credit decisioning with credit bureau integration, instalment plan management, and one merchant integration type typically runs $60,000 to $110,000 depending on the complexity of the credit policy and the integration method. Adding open banking affordability assessment, delinquency management, compliance tooling, and a BNPL analytics dashboard typically brings the total to $100,000 to $180,000. Fixed cost agreed before development starts.

What clients say

What our clients say

Three-year average engagement. Founders and operators describing the work in their own words. No marketing varnish.

Charles E.
Charles E.
USA flagUSA
Entrepreneur at Aggie Technologies

All of the sprints were completed on schedule and on budget. We highly recommend RaftLabs!

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Talk to us about your BNPL software project.

Tell us your BNPL product structure, your credit decisioning approach, and where your current checkout or instalment management process relies on manual steps or third-party platforms you've outgrown. We'll scope a BNPL platform built around your credit policy and your merchant network.

  • Scope and cost agreed before work starts. No surprises. No obligation.
  • Working prototype within 3 weeks of kickoff.
  • Pay by milestone. You see progress before each invoice.
  • 60-day post-launch warranty. Bug fixes, UI tweaks, and deployment support. No retainer.
  • All conversations are NDA-protected.