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Buy Now Pay Later Application Development

A Comprehensive Guide

ScienceSoft brings 19 years of experience in creating financial solutions to help companies design and develop robust Buy Now Pay Later applications.

Buy Now Pay Later Application - ScienceSoft
Buy Now Pay Later Application - ScienceSoft

Buy Now Pay Later Application: The Essence

A Buy Now Pay Later (BNPL) application allows shoppers to make instant online and in-person purchases and pay them off in installments, often interest-free. The solution provides consumers with a convenient and cost-effective way to afford the products and services they need.

As Buy Now Pay Later becomes an increasingly popular payment option globally, such apps have the potential to generate significant revenue for BNPL service providers and drive higher order value and frequency for merchants.

Steps to Buy Now Pay Later app development

  1. Gather business and end user requirements for the BNPL app.
  2. Plan the development tasks, project team, timelines, and budget.
  3. Design the BNPL app’s features, architecture, UX and UI.
  4. Select a cost-effective tech stack to implement the solution.
  5. Develop your BNPL app and establish the necessary integrations.
  6. Finalize QA procedures and set the ready-to-use app live.
  • Ways to provide customers with access to BNPL services: introducing a standalone BNPL app with built-in shopping capabilities, BNPL integration as one of the payment methods in merchants’ selling platforms.
  • Necessary integrations: a merchant’s selling platform, payment gateways, a credit rating platform, accounting software of a BNPL service provider.
  • Timelines: 6–11 months on average.
  • Cost: $120,000–$400,000+, depending on the software complexity. Use our free calculator to estimate the cost for your case.

Key Features of a Buy Now Pay Later Application

A Buy Now Pay Later app combines robust functionality for streamlined loan management with a comprehensive set of features for convenient and secure online and in-store shopping. Here, ScienceSoft shares a sample feature set for the application:

User registration and pre-qualification

  • Configurable self-registration forms for customers (borrowers) and merchants.
  • Geography-based KYC/AML verification.
  • (for BNPL service providers) Setting up customer requirements (monthly income, employment status, etc.) based on the internal financing policies.
  • Automated customer pre-qualification against pre-set requirements and scoring based on the data provided in the customer’s account and available credit rating data.
  • Creating custom formulas for customer credit rating assessment.
  • Rule-based customer segmentation by region, credit score, age, income, etc.
Read all

Loan terms management

  • Support for multiple installment plans (Pay in 4, Pay in 30, etc.).
  • Configurable loan terms (repayment period, annual percentage rate, loan amount thresholds, prepayment and late payment fees, etc.) for various installment plans.
  • Assigning custom terms for interest-free EMIs.
  • Multi-currency loans.
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Loan request processing

  • Automated submission of a loan request from a customer to the BNPL service provider, triggered by choosing a Buy Now Pay Later option at the checkout online (in-app or via the merchant’s selling platform) or at the point of sale.
  • Real-time analysis of a customer’s credit score and credit history and automated decision-making on loan approval.
  • Instant communication of the decision on loan approval or rejection to the customer.
  • Automated upfront payment from a BNPL service provider to the merchant upon loan approval.
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Loan repayment

  • Scheduled and ad hoc loan repayment by customers.
  • Automated calculation of EMI and a due interest amount for each loan.
  • Support for multiple loan repayment methods (a bank transfer, card, digital wallet, etc.).
  • Real-time payment processing.
  • Automated payment collection by direct debit.
  • Notifications on a payment failure and a rule-based payment retry.
  • Custom rules for payment rescheduling and loan prolongation upon a customer’s request.
  • Personalized reminders to customers on due payments.
  • Alerts on missed payments on the loan.
  • Automatically applying fees for loan repayment non-compliance with an installment plan.
  • Automated refunds to the customer’s original payment method.
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BNPL transactions tracking

  • Real-time tracking of BNPL activities (by period, amount, etc.), including:
    • loan requests
    • loan approvals
    • loan repayments by status (repaid, due, overdue)
    • refunds
    • (for BNPL service providers) payments to merchants for purchases and from merchants for BNPL services, and more.
  • A full history of BNPL transactions.
  • Automated recalculation of a customer’s credit score based on a loan repayment history and monitoring it in real time.
  • Configurable dashboards for multiple user roles (customers, merchants, BNPL service providers).
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BNPL analytics and reporting

  • (for BNPL service providers) Scheduled and ad hoc generation of reports on the granted loans and automated report submission to the required credit bureaus.
  • (for merchants) Analyzing essential BNPL-related metrics (by period, customer segment, etc.), including:
    • The number of customers that used a BNPL service.
    • Total sales revenue from purchases made with a BNPL service.
  • Average order value (AOV), and more.
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In-app shopping

  • Configurable catalogs of products and services offered by merchants.
  • (for customers) Searching and comparing product and service items across multiple catalogs by user-defined parameters, such as price, location, features, and more.
  • Instant in-app purchases.
  • Automated generation of purchase receipts.
  • (for merchants) In-app advertising.
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In-store shopping

  • Automated generation of a single-use virtual card to add to the mobile wallet (e.g., Apple Pay, Google Pay) and pay for the purchase via the card terminal.
  • Support for QR-code-based in-person payments.
  • Automated generation of a QR code that contains details on:
    • (for merchants) A merchant’s bank account and a payment currency.
    • (for customers) Customer ID and billing info.
  • Sending and receiving payments by scanning a QR code.
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Account management for app users

  • Adding, saving, and updating personal (for customers) and business (for merchants) info, billing details, including tax IDs, bank accounts and payment card details, etc.
  • End-to-end audit trail of all account activities.
  • A digital assistant to help app users solve technical, transactional, security issues.
  • (for merchants) Paying a fee for creating an account and transactional fees.
  • (for customers) Creating refund claims and attaching supporting documents.
Read all


  • Multi-factor authentication, including biometric authentication (e.g., facial or fingerprint recognition).
  • Role-based access control.
  • Payment data encryption.
  • AI-based fraud detection.
  • Customer and merchant data retention and deletion policies.
  • Compliance with ISO 27001/27002, SOC1 and SOC2, PCI DSS, AML/KYC regulations, GDPR (for the EU), other relevant global, country- and industry-specific standards and regulations.
Read all

Get Expert Help to Unlock the ROI of BNPL

Having decades-long experience in application development and integration, ScienceSoft is ready to help with:

  • End-to-end development of web and mobile Buy Now Pay Later apps for BNPL service providers.
  • Buy Now Pay Later integration in the online selling platform for merchants.

Essential Integrations for a Buy Now Pay Later App

ScienceSoft recommends that a BNPL application should integrate with the following systems to streamline payments on the loan and ensure a seamless flow of purchasing and payment data:

Integrations for a BNPL Application - ScienceSoft

  • A merchant’s selling platform (a merchant’s website, an ecommerce marketplace, POS software, etc.) – to instantly process loan requests and communicate the decision on loan approval to customers; (for in-app shopping) to ensure the accuracy of introduced information on merchants’ products and services and promptly inform merchants about the purchases made via a BNPL app.
  • Payment gateways provided by banks or independent payment services providers (e.g., PayPal, Stripe) – to enable real-time processing of payments sent by customers, merchants, and a BNPL service provider; to keep app users up to date on the status of their payments.
  • Credit rating platforms of the selected credit rating bureaus (e.g., Experian, Equifax) – for facilitated customer credit rating checks and credit report submission.
  • Accounting software of a BNPL service provider – to automatically record data on upfront payments to merchants, due and received loan repayments from customers, and payments from merchants for BNPL services in the general ledger.

Factors that Drive ROI for a Buy Now Pay Later App

In Buy Now Pay Later application development projects, ScienceSoft always looks to cover the following important factors to maximize the app’s potential to generate revenue:

Convenient UX and user-friendly UI

To drive high app adoption among customers and merchants.

Mobile access

To enable consumers to make in-app purchases on the go.

Single-use virtual cards

To let customers use a BNPL service when paying for purchases in a physical store.

Support for multiple installment plans and repayment methods

To allow customers to choose preferred financing and repayment options.

Robust security

To guarantee the protection of payment plan software and sensitive data it stores from fraudulent and malicious activities.

Easy-to-use APIs

To ensure fast and smooth app integration with required systems and eliminate double data entry.

ScienceSoft’s Senior Business Analyst and Financial and Banking IT Consultant

When powered with advanced analytics, the solution helps merchants precisely identify BNPL-related customer purchasing patterns and enables data-driven planning of segmented ads and discounts.

A Buy Now Pay Later Solution Launch Plan

Buy Now Pay Later app development typically starts with a comprehensive research of competitive environment and target audience needs and involves the steps like project planning, application design and development, integration, testing, release, support and evolution.

However, roadmaps to BNPL implementation may differ depending on your business-specific needs. Choose the service type you’re interested in to explore a sample BNPL project plan by ScienceSoft.

Custom BNPL development for BNPL service providers

The BNPL market is expected to show more than 20x growth for the next decade. Don’t miss the best time to launch your own BNPL application to maximize your market share and enjoy high and prompt ROI.

View details

BNPL integration in the online store for merchants

Drive 45% higher purchase frequency, achieve a 40%+ increase in AOV and up to 30% growth in conversion. Just let your customers get the products and services they need right now while reducing their financial burden.

View details

Buy Now Pay Later Application Development for BNPL Service Providers

Buy Now Pay Later app development with ScienceSoft usually looks as follows:


BNPL application conceptualization


Project planning


BNPL application design


Tech stack selection to implement a BNPL app


BNPL application implementation


Support and evolution of a BNPL app (optional)

Buy Now Pay Later Integration in the Online Store for Merchants

ScienceSoft typically performs the following steps to help merchants smoothly integrate Buy Now Pay Later as a payment option in their selling platforms:


Business needs analysis and requirements engineering


Project planning


Design of the BNPL integration


Choosing a BNPL integration tech stack


Implementing the BNPL integration


Support and evolution of the integration (optional).

Market-Available BNPL Solutions ScienceSoft Helps Integrate


Best for

Large ecommerce businesses.


  • Prebuilt APIs for hosted and non-hosted integration with merchants’ online stores.
  • Easy-to-use plugins to integrate with Salesforce Commerce Cloud, BigCommerce, Shopify, and other popular ecommerce platforms.
  • Support for Pay in 4, customizable biweekly and monthly installment plans.
  • Automated generation of single-use virtual cards for onsite purchases.
  • Multiple loan repayment methods, including a bank transfer, a debit card, a check.
  • No late fees for missed payments.
  • Loan transactions reporting to Experian.

Merchant fees

A flat fee of $0.30 plus a variable fee of ~ 5%–6% per purchase transaction.

Buy Now Pay Later Implementation Costs

Developing a Buy Now Pay Later application may cost around $120,000–$400,000+, depending on app functionality, the scope of supported platforms, the complexity of integrations, and more.

Below, we provide the approximate cost estimations based on ScienceSoft's expertise in BNPL software development projects:


Integrating a market-available BNPL solution into the merchant’s selling platform.


Developing a mobile BNPL app of average complexity.


Building a comprehensive web-based Buy Now Pay Later platform.

The cost, duration, and approach to BNPL implementation depends on the following factors:

For BNPL app development

  • The number and complexity of a BNPL app’s features.
  • The platform to base the app on (web, mobile, or both).
  • (for mobile installment apps) Supported mobile platforms (iOS, Android).
  • Performance, scalability, availability, and security requirements for the app.
  • Role-specific requirements for the UX and UI.
  • The number and complexity of integrations.

For BNPL integration in the online store

  • The chosen approach to the BNPL integration.
  • The number and specifics of solutions to be integrated and the number of integration points.
  • Performance, availability, scalability, security requirements for the integrated system.
  • The required modifications of the integrated solutions.

Choose Your Service Option

ScienceSoft’s BNPL implementation services are customized to your business needs and can be related to:

BNPL application development

We design and build a reliable, secure, and stylish BNPL app and offer continuous app support and upgrade. Having proven tech skills and deep expertise in the payments domain, we ensure top-flight quality and a short time to launch for your app.

I need this!

BNPL integration in the online store

We seamlessly integrate a market-available BNPL solution of your choice with your selling platform(s). You get expert advice on the optimal BNPL software to employ and quick integration with no disruption to critical selling operations.

I need this!

A Featured Success Story by ScienceSoft

IT Consulting and Team Augmentation for BNPL Product Development

ScienceSoft helped a fintech startup optimize project resources without affecting the project pace and promptly launch a top-flight BNPL product. The product enables convenient payment in installments for shoppers and provides merchants with a go-to way to introduce BNPL into their webstores.

FAQs About Buy Now Pay Later App Development

How do Buy Now Pay Later companies make money?

There is a variety of options to monetize a BNPL app, and the choice should be made based on your preferred business model. Some popular ways to generate revenue are:

  • Charging a merchant fee (a flat fee or a percentage of the transaction amount) for offering the BNPL service.
  • Charging customer fees for late payments.
  • Charging merchant fees for promotional services, e.g., offering exclusive deals or personal discounts for merchants’ clients.
  • Cross-selling or upselling other financial products, e.g., payment cards, personal loans, or insurance.
  • Selling in-app advertising.
  • Data monetization (requires app user consent).

How to tap into the BNPL market with minimal risks?

At ScienceSoft, we define the best-fitting market niche and a unique selling proposition for each BNPL app, as well as measure economic feasibility of app development to help our customers confidently start their initiatives. We also deliver a detailed project roadmap for risk-free application launch and provide precise estimates for accurate investment planning.

Who is involved in the BNPL app development process?

Typical roles on ScienceSoft’s BNPL app development teams are a business analyst, a solution architect, a project manager, a UX/UI designer, a front-end developer, a back-end developer, a DevOps engineer, and a QA engineer. If you want your app to provide AI-based analytics, we also involve data scientists to design and train BNPL machine learning models.

About ScienceSoft

ScienceSoft is a global IT consulting and software development company headquartered in McKinney, Texas. We provide full-cycle application development services to help companies design and build reliable and secure Buy Now Pay Later apps. In our projects, we employ robust quality and data security management systems backed by ISO 9001 and ISO 27001 certifications. Achieving project goals in spite of time and budget constraints, as well as changing requirements, is ScienceSoft's top priority.