Kasion kasion · payment
v0.1 · beta · cloudflare workers 🇹🇭 Bangkok-friendly · 🌏 SEA

Payment intents.
One POST.

PromptPay QR, cash, bank transfer — wired into any Kasion app in five lines.

Drop-in payment service for SEA-first products. Generates real EMVCo PromptPay QR payloads in-worker (no Stripe wrap, no PSP minimums), keeps a shared D1 ledger, exposes a CORS-clean JSON API on every kasion subdomain.

Read the API → View source Talk to us
~50ms
create intent
0
monthly minimum
4
payment methods
∞
apps share ledger
Methods

Four ways to take money

📱

PromptPay QR

flagship

Real EMVCo QR payload generated in the worker (CRC16, no deps). Customer scans with any Thai banking app — exact amount baked in.

💰

Cash

Pickup or pay-on-delivery. Status stays pending until admin marks it paid.

🏦

Bank transfer

Returns the merchant account block. Slip-upload + manual confirm via /mark-paid.

💳

Card

soon

Stripe / Omise adapter on the roadmap. Today returns a "pick another method" placeholder.

API

JSON in, JSON out

Three endpoints. No SDK. CORS allow-list covers the four kasion subdomains + localhost.

POST /v1/charge create intent 
{
  "appId":     "rachada-restaurant",
  "orderRef":  "o_abc123",
  "amount":    320,
  "method":    "promptpay",
  "metadata":  { "items": 4 }
}
GET /v1/charge/:id read state 
{
  "id":     "pay_…",
  "status": "pending",
  "amount": 320,
  "method": "promptpay",
  "instructions": {
    "promptpayId": "0810000001",
    "qrPayload":   "00020101021229370016A000000677010111…"
  }
}
POST /v1/charge/:id/mark-paid manual confirm 
{ "txnId": "BANK-REF-123" }   // optional
Why this exists

Built for SEA-first founders

No PSP minimums

Most Thai PSPs gate at ฿2k–10k/mo + KYC. PromptPay QR rails are free at the bank level — this just generates the right payload.

Shared ledger across apps

Restaurant, AI app, mobile checkout — all post to /v1/charge with their own appId. One D1 query reconciles everything.

Edge-native

Cloudflare Workers + D1. ~50ms global p99 for create-intent. No cold starts, no servers.

Pricing

Free during beta

kasion-org apps
฿0
unlimited intents

Internal kasion-dev apps run on the shared infra.

external · beta
฿0
first 1k intents/mo

DM hello@kasion.dev for an API key.

enterprise
talk to us
SLA · dedicated D1

Card rails, webhook fan-out, multi-tenant ledger separation.

Wire it into your app today

Live on https://pay.kasion.dev. CORS-allowed for Kasion subdomains. DM us for an external key.

Get an API key Read the docs