Payment infrastructure built for modern businesses.
FleakStack gives businesses and developers the infrastructure to accept payments, build checkout experiences, manage transactions and ship payment functionality into their own products — through one API.
Everything you need to move money through your product.
A complete set of payment building blocks — from collection to reconciliation — available through one integration.
Payment Collection
Accept payments through modern payment channels built for reliability at scale.
Learn morePayment Links
Create shareable links that let customers pay without any integration work.
Learn moreWebhooks
Receive payment events in real time and keep your systems in sync automatically.
Learn moreTransaction Management
Track and manage every payment with clear, structured transaction records.
Learn moreOne API. Powerful payment infrastructure.
Send a single request to create a payment. FleakStack handles routing, verification and confirmation, then notifies your system with a webhook.
Read Documentation# Illustrative example POST /api/v1/payments { "amount": 25000, "currency": "NGN", "email": "customer@example.com", "reference": "ORDER-10001" } # Response { "status": "success", "reference": "FSK-PAY-10001", "amount": 25000, "currency": "NGN" }
A product built around how payments actually work.
Accept payments in one flow.
Customers pay with card or bank transfer through a checkout experience that stays consistent across every channel.
{
"event": "payment.success",
"reference": "FSK-PAY-10001",
"amount": 25000,
"currency": "NGN",
"customer": "customer@example.com"
}
Give customers a checkout experience they can trust.
A clean, predictable payment interface reduces friction and helps customers complete payments with confidence.
Built for every stage of building a payment experience.
Startups
Launch payment functionality quickly without building infrastructure from scratch.
Businesses
Accept and manage customer payments with tools built for day-to-day operations.
Developers
Build custom payment experiences using a documented, predictable API.
Platforms
Embed payment infrastructure into larger products serving many merchants.
Infrastructure built with security in mind.
FleakStack is designed around secure defaults at every layer of the payment flow.
Secure API authentication
Every request is authenticated using API keys scoped to your account.
Webhook verification
Verify that incoming webhook events genuinely originated from FleakStack.
Transaction references
Every payment carries a unique reference you can reconcile against your records.
Audit trails
Track the full lifecycle of a payment from creation to settlement.
Protected credentials
API keys and secrets are handled separately from payment data.
Encrypted connections
All communication with the FleakStack API takes place over encrypted connections.
Build your next payment experience with FleakStack.
Simple APIs. Seamless checkout. Powerful payment infrastructure.