Fintech · Payments
Payment Gateway Solutions
We build payment gateways, PSP platforms and payment integrations — from merchant checkout to settlement, reconciliation and reporting.
Our Experience
What We Build
AMBI TECH BD has designed and delivered multiple payment gateway solutions: complete gateway platforms for payment service providers, and gateway integrations for e-commerce, SaaS and enterprise systems. We understand the parts that make payments hard — idempotency, reconciliation, settlement, security and audit — and engineer for them from day one.
Payment gateway / PSP platform
A complete gateway for your merchants: onboarding and KYC, API keys, hosted checkout, transaction routing, refunds, settlements, fees and merchant dashboards.
Gateway integration
Integrate Stripe, PayPal, card processors and regional gateways into your website, app or ERP — with webhooks, retries, refunds and clean reconciliation.
Billing, wallets & payouts
Recurring subscriptions, invoices, stored balances, split payments and automated payouts to vendors, agents or partners.
How It Works
How a payment flows through the platform
- 01
Checkout
Customer pays on hosted checkout, SDK or API
- 02
Authorize
Request is validated, risk-checked and routed
- 03
Process
Bank, card network or wallet confirms the payment
- 04
Notify
Signed webhooks & callbacks update the merchant
- 05
Settle
Fees calculated, funds settled and reconciled
Features
Key Capabilities
Merchant onboarding & KYC
Applications, document verification, approval workflow and per-merchant configuration.
APIs, SDKs & webhooks
Versioned REST APIs, signed webhooks, sandbox environment and developer documentation.
Refunds & disputes
Full and partial refunds, chargeback handling and a complete transaction timeline.
Settlement & payouts
Configurable fees and MDR, settlement cycles, payout batches and bank file generation.
Reconciliation
Automated matching between gateway, bank statements and your ledger — mismatches flagged instantly.
Dashboards & reports
Merchant and admin dashboards: volumes, success rates, settlements and exportable reports.
Fraud & risk controls
Velocity limits, amount rules, blacklists and suspicious-activity review queues.
Recurring billing
Subscriptions, retries for failed payments, invoices and customer self-service.
Security by design
- Built following PCI DSS principles — card data is tokenized and never stored in your systems
- Idempotent transaction APIs so retries never create double charges
- Double-entry ledger with an immutable audit trail for every state change
- Encryption in transit and at rest, secrets in a vault, strict access roles
- HMAC-signed webhooks, IP allow-lists and replay protection
- Monitoring and alerting on failure rates, latency and settlement anomalies
Payment methods & gateways
- Stripe
- PayPal
- Visa / Mastercard
- Bank transfers
- bKash
- Nagad
- Rocket
- SSLCommerz
- aamarPay
- ShurjoPay
FAQ
Frequently Asked Questions
Can you build a complete payment gateway, not just an integration?
Yes. We build full gateway / PSP platforms including merchant onboarding, checkout, transaction processing, refunds, settlement, reconciliation and merchant dashboards — as well as simpler integrations into existing products.
Which payment methods can you integrate?
International gateways such as Stripe and PayPal, card payments, bank transfers, and regional providers such as bKash, Nagad and SSLCommerz. If a provider has an API, we can integrate it.
How do you handle security and compliance?
We follow PCI DSS principles: card data is tokenized by certified processors, all traffic is encrypted, every transaction change is audited, and access is role-based. We also support your compliance and audit process with documentation.
How long does a payment integration take?
A single gateway integration with refunds and webhooks typically takes 2–4 weeks. A full gateway platform is planned in phases, starting with an MVP in roughly 3–4 months.
Let's Build Your Payment Gateway Platform
Tell us what you're trying to build, automate, or improve. We'll help you explore the right technical solution.
Prefer email?contact@ambitechbd.com