> ## Documentation Index > Fetch the complete documentation index at: https://docs.crypto.westminister.tech/llms.txt > Use this file to discover all available pages before exploring further. # Generate Payment QR Code > Generates QR code data for payment addresses. Supports both on-ramp (ON_RAMP_BUY) and off-ramp (OFF_RAMP_SELL) orders. **For Off-Ramp Orders:** - QR code contains escrow wallet address - Customer can scan to send USDT to escrow - Amount is pre-filled in the QR code **For On-Ramp Orders:** - QR code contains customer's wallet address - Shows where customer will receive USDT - Amount is pre-filled in the QR code **QR Code Format:** - Tron: `tron:{address}?amount={amount_in_smallest_unit}` - Ethereum: `ethereum:{address}?value={amount_in_smallest_unit}` The frontend can use any QR code library to generate an image from the `qr_code_data` or `uri` field. ## OpenAPI ````yaml /openapi.yaml get /api/v1/auth/orders/{order_id}/qr-code openapi: 3.1.0 info: title: EmaalCoin API description: > EmaalCoin API reference. These APIs power cryptocurrency exchange between USDT and Fiat trading. - **On-Ramp**: Buy USDT with fiat (KES) via mobile money (STK Push for Kenya) - **Off-Ramp**: Sell USDT for KES with mobile money payout (Kenya) - **Ethereum, TRON, and Solana**: Multi-chain wallet support - **Merchant Offers**: Create and manage trading offers - **OTC Flows**: Bank and mobile money deposits/withdrawals for merchants - **Pricing engine**: FX quotes and fee profiles for quote-backed orders and transfers - **P2P/B2B transfers**: Internal and external stablecoin sends (USDT/USDC) with optional pricing snapshots - **Stablecoin swaps**: Treasury-backed two-leg USDT ↔ USDC conversion with BitGo confirmation, inventory reservation, and automatic refunds - **Multisig**: Collaborative and platform-managed multisig flows for high-value B2B version: 1.1.0 servers: - url: https://crypto.westminister.tech description: Production API (requires DNS for this hostname). - url: http://13.42.110.185:8080 description: >- UAT on EC2 (direct). Use this base when building proof PDF URLs if the production hostname does not resolve. security: [] tags: - name: Pricing description: >- Commercial pricing profiles and FX rate quotes (admin). Used with orders and transfers for auditable snapshots. - name: Transfers description: >- P2P and B2B stablecoin transfers (USDT/USDC). Optional fiat-equivalent pricing fields. B2B multisig behavior depends on wallet registration (synchronous completion vs proposal flow). - name: Stablecoin Swaps description: >- Treasury-backed USDT ↔ USDC conversions for BitGo provider-managed wallets on `tron`, `ethereum`, or `solana`. Collection confirms before treasury payout starts. Completion requires both legs and dual-asset balance synchronization. - name: Multisig description: >- Multisig wallet registration and TRON proposal/confirm flows (vendor/admin). - name: Escrow Wallets description: Escrow pool wallet metadata for off-ramp and operations. - name: Users description: >- User-related operations (registration, lookup, updates, counts, status changes) - name: Wallets-Users description: User wallet operations (create, manage, query balances) - name: Offers description: Offer operations (create, read, list, counts) - name: Orders description: Order operations (create, update, list, counts, stats) - name: Payment description: Payment initiation operations - name: Merchants description: > Merchant (vendor) onboarding and hierarchy operations. USE **GET /API/V1/AUTH/MERCHANTS** WITH **PAGE_ID** AND **PAGE_SIZE** TO PAGE MASTER VENDORS. USE **GET /API/V1/AUTH/MERCHANTS/{MERCHANT_ID}** FOR ONE MASTER VENDOR, **MERCHANT_WALLETS**, AND ALL **SUBVENDOR** ROWS WITH **WALLETS** (FULL TREE). - name: OTC Deposits description: > OTC fiat-to-crypto deposits (bank or mobile money). Rows live in **`otc_deposits`**. Merchants create drafts or one-shot deposits. **admin**, **otc_officer**, or **treasury** list all deposits. B2B bank flow uses draft, quote, submit, proof, assign, claim, settlement, and audit. **`credited_to_address`** is the merchant on-chain wallet treasury credits (resolved from the default wallet for **`requested_network`** on the master merchant ledger user or any **sub-vendor** under that merchant). **`GET /api/v1/auth/otc/deposits`** backfills missing **`credited_to_address`**/**`to_wallet_id`** when a wallet can be resolved. One-shot **`POST /api/v1/auth/otc/deposits`** persists the payout address when **`requested_network`** is sent. Bank proof PDFs upload via `POST .../proof` and are viewed at **`GET /otc-deposits-proof/{deposit_id}/{file}.pdf`** (relative **`proof_url`**/**`file_url`** plus API base URL). Merchants may edit tab-1 draft fields with **`PATCH /api/v1/auth/otc/deposits/{id}/draft`** while **`status`** is **`draft`**. - name: OTC Withdrawals description: >- OTC crypto-to-fiat withdrawals (bank or mobile money). Merchants create. Admin approves and executes. - name: OTC Config description: OTC display config (bank details, mobile money paybill) for merchant UI - name: Fiat Currencies description: > Shared platform **fiat_currencies** catalog. **GET /api/v1/auth/fiat-currencies** lists active rows for UI pickers. **GET /api/v1/auth/fiat-currencies/admin** lists all rows including inactive (admin). Admin manages rows with **GET /api/v1/auth/fiat-currencies/{id}**, **POST /api/v1/auth/fiat-currencies**, **PATCH /api/v1/auth/fiat-currencies/{id}**, and **DELETE /api/v1/auth/fiat-currencies/{id}**. Use for OTC, pricing, orders, remittance, and backoffice — not under **`/otc/...`**. Prefer **PATCH** with **`is_active: false`** over delete when a currency is referenced. - name: Countries description: >- Shared platform **countries** catalog. Public **GET /api/v1/countries** lists active rows for pickers. Auth **GET /api/v1/auth/countries** returns the same active catalog. Admin manages rows with **GET /api/v1/auth/countries/admin**, **GET /api/v1/auth/countries/{id}**, **POST /api/v1/auth/countries**, **PATCH /api/v1/auth/countries/{id}**, and **DELETE /api/v1/auth/countries/{id}**. - name: Files description: Authenticated file uploads for OTC receipts and proof artifacts. paths: /api/v1/auth/orders/{order_id}/qr-code: get: tags: - Orders summary: Generate Payment QR Code description: > Generates QR code data for payment addresses. Supports both on-ramp (ON_RAMP_BUY) and off-ramp (OFF_RAMP_SELL) orders. **For Off-Ramp Orders:** - QR code contains escrow wallet address - Customer can scan to send USDT to escrow - Amount is pre-filled in the QR code **For On-Ramp Orders:** - QR code contains customer's wallet address - Shows where customer will receive USDT - Amount is pre-filled in the QR code **QR Code Format:** - Tron: `tron:{address}?amount={amount_in_smallest_unit}` - Ethereum: `ethereum:{address}?value={amount_in_smallest_unit}` The frontend can use any QR code library to generate an image from the `qr_code_data` or `uri` field. parameters: - name: order_id in: path required: true schema: type: string format: uuid description: Order ID responses: '200': description: QR code data generated successfully content: application/json: schema: type: object properties: qr_code_data: type: string description: QR code data string (payment URI) example: tron:TYuPXD3E3ckuTAmCU5kiuNQjnYrcSBViMq?amount=12500000 address: type: string description: >- Payment address (escrow for off-ramp, customer wallet for on-ramp) example: TYuPXD3E3ckuTAmCU5kiuNQjnYrcSBViMq amount: type: string description: USDT amount in standard format example: '12.50000000' network: type: string description: Blockchain network example: tron uri: type: string description: Full payment URI (same as qr_code_data) example: tron:TYuPXD3E3ckuTAmCU5kiuNQjnYrcSBViMq?amount=12500000 examples: tron_off_ramp: summary: Tron Off-ramp QR Code value: qr_code_data: tron:TYuPXD3E3ckuTAmCU5kiuNQjnYrcSBViMq?amount=12500000 address: TYuPXD3E3ckuTAmCU5kiuNQjnYrcSBViMq amount: '12.50000000' network: tron uri: tron:TYuPXD3E3ckuTAmCU5kiuNQjnYrcSBViMq?amount=12500000 ethereum_off_ramp: summary: Ethereum Off-ramp QR Code value: qr_code_data: >- ethereum:0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb?value=12500000 address: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb' amount: '12.50000000' network: ethereum uri: >- ethereum:0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb?value=12500000 on_ramp: summary: On-Ramp QR Code (Customer Wallet) value: qr_code_data: tron:TPY7ewYk2eY9b4TTYkCHJH3Cqudh3NU6tM?amount=1200000000 address: TPY7ewYk2eY9b4TTYkCHJH3Cqudh3NU6tM amount: '1200.00000000' network: tron uri: tron:TPY7ewYk2eY9b4TTYkCHJH3Cqudh3NU6tM?amount=1200000000 '400': description: Bad request (invalid order type, missing address, etc.) '404': description: Order not found security: - bearerAuth: [] components: securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: PASETO ````