Send a link. Get paid. It's that simple.
OnePay lets you invoice customers and collect payments online in minutes — no developers, no paperwork.
Talk to our teamEverything you need to get paid
Built for merchants who want a faster, simpler way to collect payments.
Invoicing
Create professional invoices in seconds and send them straight to your customers.
Payment links
Turn any invoice into a secure payment link you can share by email, SMS, or chat.
Multi-provider payments
Accept QPay, Golomt, and Bonum — all through one link, one dashboard.
Refunds
Handle refund requests directly through the same secure link, with no back-and-forth.
Why merchants choose us
A payment experience your customers will trust — and you can manage with confidence.
Real-time tracking
See the status of every invoice and payment the moment it changes.
Bank-grade security
Every transaction is encrypted end-to-end and processed through licensed providers.
Multi-currency support
Bill in MNT, USD, or JPY with automatic conversion at checkout.
Local support
Our team speaks Mongolian, English, and Japanese — and is ready to help.
Built for developers and AI
Integrate payments into your own software — or let an AI assistant run your merchant account for you.
REST API
Create invoices, issue payment links, and manage customers programmatically with token-authenticated endpoints, an OpenAPI spec, and a ready-made Postman collection.
AI assistant (MCP)
Connect Claude or any MCP-compatible assistant to your merchant account — it can create invoices and send payment links for you in plain language.
Plan and settle together
Create a shareable event for a group expense or a time that works for everyone.
Schedule
Collect availability for proposed times and agree on the best option together.
Start a ScheduleReady to start accepting payments?
Tell us about your business and we'll help you get set up.
Contact usA service by Tab Systems Mongolia — tabsystems.tech