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API Development & Integration

Connect your tools, automate your workflows and make your systems talk to each other

We build custom APIs and integrate third-party services, payment gateways, WhatsApp automation, CRMs, ERPs, SMS platforms, analytics tools and more. Stop copying data between systems manually and let your software do the work.

Discuss Your Integration See What We Integrate
Fully Documented Swagger / OpenAPI docs included.
Secure by Default Auth, rate limiting, validation.
Market-Ready Paystack, Flutterwave, NIN, BVN.

How APIs connect your systems

Your App
Client
Request
API Layer
DigitalX-built
Calls
Paystack
Payment
Triggers
WhatsApp
Notification
Syncs
CRM
Records

Popular integrations

₦Paystack FFlutterwave WhatsApp API GGoogle APIs SlSlack HsHubSpot TwTwilio SgSendGrid FbFirebase StStripe
API integration and backend development detail API Development & Integration

Trusted By

The Problem

Your tools don't talk to each other, and your team is paying for it

Most businesses run on a collection of disconnected tools. Data gets copied manually, mistakes get made, and hours are wasted every week on work that software should be doing automatically.

Without API Integration

Manual data entry between systems

Payment confirmed in Paystack, someone manually updates the CRM, the spreadsheet and the WhatsApp group. Three steps, three chances for human error.

Customers left in the dark after payment

Payment lands, but the customer gets no confirmation for hours because someone has to manually send it. Bad experience, unnecessary support queries.

Duplicate records and data mismatch

The same customer exists three times in three systems with slightly different details. No one knows which is correct. Reports are unreliable.

No real-time visibility across operations

You can't see what's happening across sales, payments, fulfilment and support in one place, because the data lives in different systems with no connection.

With DigitalX API Integration

Automatic data sync across all systems

Payment confirmed → CRM updated, invoice generated, WhatsApp message sent, spreadsheet logged. All in under 3 seconds, zero human involvement.

Instant customer notifications

The moment a payment is verified, the customer gets a WhatsApp confirmation with their order details, automatically, every time, no manual work.

Single source of truth for all customer data

One integration keeps your CRM, payment system and app database in sync, same data everywhere, no duplicates, reports you can trust.

Real-time operational dashboard

All your tools feeding into one dashboard, payments, orders, support tickets, fulfilment status, visible in real time without switching between systems.

Integration Categories

What we integrate and connect

We've built integrations across every major category of business software, local and international.

Payment Gateways

Full payment integration, card, bank transfer, USSD, mobile money, recurring billing, webhook verification, refunds and reconciliation.

Paystack Flutterwave Remita Interswitch Stripe Monnify

Messaging & Communication

WhatsApp Business API, SMS gateways, email platforms and in-app chat, for customer notifications, support automation and transactional messaging.

WhatsApp Business API Twilio SendGrid Termii Mailchimp Firebase FCM

CRM & Sales Tools

Sync contacts, deals, notes and activity between your app and your CRM, keeping sales teams up to date automatically without manual entry.

HubSpot Salesforce Zoho CRM Pipedrive Freshsales

Identity & KYC Verification

identity verification for regulated products, BVN lookup, NIN verification, CAC business registration checks and international KYC providers.

Dojah Smile Identity Youverify Prembly NIBSS

Google & Productivity APIs

Google Maps, Places, Calendar, Sheets, Drive, Gmail, Analytics, Search Console, automate reports, sync data to Sheets, embed maps and more.

Google Maps Google Sheets Google Calendar Gmail API Notion Airtable

ERP & Accounting Systems

Connect your app to accounting and ERP systems, sync orders, invoices, payments and inventory automatically between your software and your books.

QuickBooks Xero Sage SAP Odoo Wave

Logistics & Delivery APIs

Shipping rate calculation, tracking number generation, delivery status webhooks and last-mile delivery APIs for regional and international logistics providers.

Sendbox DHL API GIG Logistics Kwik Google Maps Routing

Analytics & Data Platforms

Send events to analytics platforms, build data pipelines between systems and push business data into BI tools for reporting and dashboards.

Google Analytics Mixpanel Segment Amplitude Power BI Metabase

AI & Automation APIs

OpenAI, Claude and Gemini API integrations for intelligent features, chatbots, document processing, content generation, classification and data extraction.

OpenAI Claude (Anthropic) Gemini Zapier Make (Integromat)
Our approach

We don't just plug in an API, we design the integration properly so it doesn't break.

Most API integrations fail in production, not because the code was wrong at launch but because no one thought about error handling, webhook retries, rate limiting, token expiry or what happens when the third-party service goes down. We build integrations that handle real-world conditions: failures, timeouts, duplicate events and edge cases that only appear under load.

  • Error handling & retry logic
  • Webhook signature verification
  • Rate limit handling
  • Idempotent operations
  • Full API documentation (Swagger)
  • Logging & monitoring
Discuss Your Integration View Our Work
API Development & Integration

Outcome

Systems that stay connected, data that stays in sync and workflows that run automatically, without your team doing it manually.

Services

API development & integration services

From building an API from scratch to connecting your existing tools, we cover every API scenario.

Custom API Development

RESTful and GraphQL APIs built from scratch, well-architected, versioned, authenticated and fully documented. Built for the apps, teams and third parties that need to consume them.

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Payment Gateway Integration

Complete Paystack and Flutterwave integration, payment initialisation, webhook verification, recurring charges, split payments, refunds and reconciliation reports. Including USSD and bank transfer flows.

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WhatsApp Business API

Automated WhatsApp messaging via the official Business API, order confirmations, payment receipts, delivery updates, OTP delivery, appointment reminders and customer support chatbots.

Get a quote

Webhook Systems & Event Pipelines

Reliable webhook ingestion and processing, signature verification, idempotency handling, retry queues, failure alerting and event logging. Built to handle production volumes without data loss.

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Third-Party System Sync

Two-way data sync between your app and external platforms, CRMs, ERPs, accounting tools, Google Sheets, project management tools, so data is always consistent everywhere.

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API Documentation & Developer Portal

Swagger/OpenAPI documentation, interactive API explorer, authentication guides, code samples in multiple languages and developer onboarding materials, for teams or third parties consuming your API.

Get a quote
Engineering Standards

What a production-grade API integration actually requires

Most integrations work in testing. These are what make them work reliably in production, under real load, with real edge cases.

Authentication & Security

API keys, OAuth 2.0, JWT tokens, webhook signature verification and request validation, so only authorised callers can access your API and fake webhook events are rejected.

Retry Logic & Idempotency

Webhooks can be delivered more than once. Our integrations detect and deduplicate duplicate events, so a payment webhook arriving twice doesn't charge the customer twice.

Rate Limit Handling

Every third-party API has rate limits. We implement request queuing, exponential backoff and intelligent caching so your integration never exceeds limits or drops requests.

Logging & Audit Trail

Every API call, webhook event and integration action is logged with timestamps, payloads and outcomes, so you can debug issues, audit activity and trace any transaction.

Error Handling & Alerting

All integration failures are caught, categorised and handled gracefully, with automatic alerting to your team for critical failures and a dead-letter queue for failed events that need reprocessing.

Full Documentation

Every API we build or integrate is documented in Swagger/OpenAPI, endpoints, parameters, request/response schemas, error codes and authentication methods, so your team or other developers can work with it without asking us.

Our Work

Recent API & integration projects

A selection of integrations and custom APIs we've built for businesses, payments, communications, identity and data sync.

App → Paystack → Webhook → DB + WhatsApp
Payment Integration

ThriftNest, Paystack Recurring Debit

Paystack recurring charge integration for a group savings app, automated monthly debit, webhook-verified confirmations, failed charge retry logic and WhatsApp receipt notifications.

Paystack Recurring Billing WhatsApp
Loan App → WhatsApp API → Chatbot → Customer
Messaging Integration

CashFlow Lending, WhatsApp Automation

WhatsApp Business API integration for a consumer lender, loan status updates, repayment reminders, payment confirmation receipts and FAQ chatbot responses.

WhatsApp API Chatbot Fintech
Mobile App → REST API → DB
REST API → Admin Panel
Custom API

Dokita Telemedicine, Core API

Custom REST API powering a telemedicine mobile app, patient records, doctor availability, appointment booking, prescription management and video session tokens.

REST API HealthTech Swagger Docs
User Signup → Dojah KYC → BVN Check → Approved
Identity & KYC

PocketSave, BVN & NIN Verification

KYC integration for a fintech savings app, BVN lookup via Dojah, NIN verification, liveness check and automated account approval workflow with compliance audit trail.

Dojah BVN / NIN Fintech KYC
Website → Sync Engine → HubSpot
↑ Google Sheets
Data Sync

Arbor Capital, CRM & Sheets Sync

Two-way sync between a financial advisory firm's website, HubSpot CRM and Google Sheets, new leads, deal updates and client notes propagated automatically in real time.

HubSpot API Google Sheets Two-way Sync
School App → Flutterwave → Receipt → SMS + Email
Payment Integration

Classport, School Fee Collection

Flutterwave integration for a school management SaaS, fee invoice generation, bank transfer and card payment acceptance, automatic receipts via SMS and email, and payment status dashboard for bursars.

Flutterwave SMS + Email EdTech
Vendor App → Public API → Buyer App
Public API → Third Party
Custom API

Vendorhub, Public Marketplace API

REST API powering a B2B marketplace, vendor product catalogue, search and filter endpoints, RFQ submission, order management and a documented developer portal for third-party integrations.

Public API Developer Portal B2B
Order Event → Notification Hub → Push
Notification Hub → SMS + Email
Messaging Integration

SwiftRide, Multi-Channel Notifications

Unified notification system for a logistics platform, Firebase push, Termii SMS and SendGrid email triggered by order events, all routed through a central notification engine.

Firebase FCM Termii SMS SendGrid
App Events → Data Pipeline → Metabase → Reports
Data Pipeline

Agrify, Analytics Data Pipeline

Event-driven data pipeline from a SaaS platform into a Metabase analytics dashboard, field data, usage metrics, financial summaries and impact KPIs updated in near-real-time.

Data Pipeline Metabase AgriTech

Want architecture diagrams, technical documentation or more detail on any of these integrations?

Request Portfolio Access
Pricing

API & integration packages

Most integrations are scoped individually, contact us with your brief for an exact quote. These packages cover the most common engagement types.

All packages include full API documentation, error handling, webhook verification, logging and 30 days of post-delivery support.

Single Integration

For businesses that need one specific third-party service integrated, a payment gateway, WhatsApp messaging, SMS notifications or a CRM sync.

₦80,000

Includes

  • Integration with 1 third-party API
  • Webhook handling where applicable
  • Error handling + retry logic
  • Basic integration documentation
  • 30 days support after delivery
Get a Quote

Integration Bundle

Most Popular

For businesses connecting multiple tools at once, payments + notifications + CRM sync, all built and documented together.

₦250,000

Includes

  • Up to 4 third-party integrations
  • Full webhook system with retry queue
  • Centralised logging + monitoring
  • Full Swagger/OpenAPI documentation
  • Staging + production environments
  • 60 days support after delivery
Get a Quote

Custom API Build

For businesses that need a custom API built from scratch, to power their app, expose data to third parties, or replace manual operations with automated workflows.

₦400,000

Includes

  • Full REST or GraphQL API design
  • Authentication (API keys / OAuth 2.0)
  • Rate limiting + request validation
  • Full Swagger docs + developer portal
  • Third-party integrations included
  • 90 days support after delivery
Get a Quote Discuss Custom Scope
Not sure which package applies? Most integration projects are scoped individually because every integration is different. Tell us what systems you want to connect and what you want to happen automatically, we'll come back with a clear scope and fixed price within 48 hours.
Describe Your Integration

Prices shown are starting rates. Final pricing is confirmed based on project scope.

Get Started

Tell us what you want to connect, we'll tell you how to do it and what it'll cost.

Describe the systems you're working with, what data needs to flow between them and what should happen automatically. We'll respond with a clear technical approach and a fixed-price quote within 48 hours.

What we'll figure out together
  • Exactly which APIs and systems need to connect
  • What data flows and triggers are needed
  • Fixed price, timeline and any access credentials needed
Describe Your Integration View Our Work
What to include in your brief
  • Which tools/systems you're working with
  • What should happen automatically (e.g. "when payment confirmed → send WhatsApp")
  • Your tech stack or current backend language
  • Whether this is a new build or an existing codebase
  • Your target go-live date
Process

How an API integration project works

1

Brief & Technical Scoping

We understand what needs to connect, map the data flows and events, review the APIs involved and produce a technical specification with a fixed-price quote.

2

Build & Test on Staging

Integration built and tested thoroughly on a staging environment, edge cases, failure modes, webhook retries and rate limits all tested before going near production.

3

Deploy to Production

Deployed to your production environment with monitoring active, we watch the first live transactions together to confirm everything is working as expected under real conditions.

4

Handover & Support

Full documentation delivered, your team walked through the integration and 30+ days of post-delivery support included to handle any issues that emerge in production.

FAQ

Frequently asked questions

Common questions about API integration projects, timelines, security and how we work.

Usually yes, we'll need read access to your existing backend code to understand the data models, existing patterns and deployment environment. For some integrations (e.g. a webhook receiver or standalone sync service) we can build a separate microservice that connects to your systems via API without needing full codebase access. We'll clarify what we need after reviewing your brief.

It happens often, especially with third-party platforms. We're experienced with reverse-engineering poorly documented APIs, working through Postman collections, testing undocumented endpoints and liaising with third-party technical support to get what we need. We factor in extra time in our scope when documentation is weak, and we document what we find ourselves so your team has a reference going forward.

Every Paystack webhook we build verifies the X-Paystack-Signature header against your secret key using HMAC SHA512, so fake or tampered webhook events are rejected before any business logic runs. We also implement idempotency checks so duplicate webhook deliveries (which Paystack can send during retries) don't result in duplicate orders or payments. Same approach for Flutterwave and other payment gateways.

The official WhatsApp Business API requires a dedicated business phone number, a number that's on the WhatsApp Business API cannot be used simultaneously on WhatsApp Web or the regular app. If you have a number you want to keep for manual chat, we'd recommend a separate number for automated messaging. We handle the Meta Business verification process and API setup as part of the integration.

Simple single integrations (e.g. Paystack payment flow): 5–10 business days. Integration bundles (3–4 services): 2–4 weeks. Custom API builds: 3–8 weeks depending on complexity. WhatsApp Business API setup includes Meta's approval process which can add 1–2 weeks outside our control. We provide a detailed timeline with the quote.

We match your existing stack, Node.js, Laravel/PHP, Python, or others. If you have a preference or an existing backend we're adding to, we build in the same language so your team can maintain and extend it. For standalone integration services or microservices, we default to Node.js or Python FastAPI, which are well-suited for event-driven, API-heavy workloads.
Ready to connect your tools?

Tell us what systems you're working with and what you want to automate, we'll respond with a technical approach and fixed quote within 48 hours.

Describe Your Integration View Our Work
Contact

Let's connect your systems

Tell us what you want to automate, which tools, what should trigger what, and what the outcome should be. We'll come back with a technical approach and fixed quote within 48 hours.

Phone(+234) 905 428 8560
Emailinfo@digitalx.com.ng
dev@digitalx.com.ng
Address
Allen Ikeja, Lagos Nigeria
Bodija Ibadan, Oyo Nigeria
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