Introduction To FLEX

Build with FLEX

FLEX helps you move money with wallet-native experiences and API-first payment rails. You can use PayTag-based identity, direct payment requests, partner collection flows, and end-of-day settlement.

Start with wallet SSO

Launch payTag-based authentication, wallet access, transfers, and payment request flows.

Choose your integration path

Wallet SSO

Let users sign in with PayTag, access wallets, and transact inside your app.

Merchant API

Accept collections with payment requests (OneTap), QR code flows, and payTag resolution.

Partner gateway API

Collect funds from FLEX wallet users using partner and terminal-oriented endpoints.

Switching service (IDAAS)

Route cross-application transactions with participant acceptance and daily settlement.

What you can build

Authentication and consent

Authenticate users, capture consent, and issue tokens for secure API access.

Wallet and transfer flows

Create wallet-native transfer experiences for P2P and merchant-related use cases.

QR and payment requests

Generate payment requests and QR payloads for fast in-app or assisted checkout.

Settlement-aware switching

Orchestrate transaction honoring and reconcile net positions during settlement cycles.

Integrate in four steps

Pick your product surface

Choose Wallet SSO, Merchant API, Partner API, or IDAAS based on your business model.

Set up credentials and authentication

Configure your x-client-id and x-api-key, then complete the required auth flow.

Implement core transaction journeys

Build your required flow: wallet transfers, payment requests, partner collections, or switching routes.

Go live with webhooks and monitoring

Verify webhook signatures, handle retries, and track transaction and settlement states.

API references and SDK

Wallet SSO API reference

Explore request and response schemas for the SSO API surface.

Merchant API reference

Review Merchant endpoints for payment requests and QR flows.

Partner API reference

Review Partner and terminal endpoints for collection workflows.

Flutter SDK

Embed FLEX wallet onboarding, login, and transaction experiences in your Flutter app.

Need help?

If you need credentials or architecture guidance, email developer@yourflexpay.com.

​Build with FLEX