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Web Development

API Integrations, Payment Gateways & Microservices

Connect disparate software systems: payment gateways, courier APIs, ERPs, CRMs, and messaging automation.

Connect Your Systems ↗ View Scope & Deliverables ↓
API Integrations, Payment Gateways & Microservices - Zendbot
Eliminate manual data entry and brittle spreadsheets. We build reliable, fault-tolerant integration pipelines between your core software and third-party services.

With automatic retry mechanisms, rate-limiting, encrypted webhooks, and idempotent transactions, your data stays synchronized in real-time.

Key Deliverables

Scope & Handover Items

01

Custom API middleware & webhook receivers

02

Payment gateway integrations (bKash, Nagad, SSLCommerz, Stripe, PayPal)

03

Courier APIs (Steadfast, Pathao, RedX, Paperfly)

04

ERP & Accounting connectors (SAP, Tally, QuickBooks, Zoho)

Technical Architecture

Core Subsystems & Standards

  • Queue-driven async processing for high throughput
  • Idempotent transaction logs & error alert notifications
  • OpenAPI / Swagger documentation generation
  • SMS gateway automation (Greenweb, BulkSMS, Twilio)

Delivery Pipeline

How We Deliver This Service

STEP 01

API Audit

Review endpoint specifications, authentication protocols, and payload schemas.

STEP 02

Middleware Build

Write robust API handlers with retry queues and security validation.

STEP 03

Sandbox Testing

Simulate edge cases, connection timeouts, and high transaction volumes.

STEP 04

Production Deployment

Switch to live API keys with real-time health checks and monitoring.

Frequently Asked Questions

Questions about this service

01 How do you prevent duplicate charges during API timeouts? +

We implement idempotent request tokens, database transaction locks, and webhook reconciliation workers.

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