One payment hub.
Every store you own.

Satellite stores create sessions server-to-server. Customers pay on this hosted checkout. Stores get a signed webhook and a signed redirect back.

Try the full flow as "Alpha Gadgets"

Gateways without credentials run in signed sandbox mode.

Features

Idempotent sessions

One session per store + order. Concurrent requests collapse onto a single locked row.

Gateway proxy

Gateways only ever see this hub. Store identity never leaves the server.

Signed webhooks

HMAC-SHA256 server-to-server delivery with retries, plus signed browser redirects.

POST /api/v1/sessions/create

curl -X POST $HUB/api/v1/sessions/create \
  -H "x-api-key: pk_test_store_alpha_7f3a9c" \
  -H "x-api-secret: sk_test_store_alpha_2b8e41d6c0" \
  -H "content-type: application/json" \
  -d '{"order_id":"1042","amount":1250,"currency":"BDT",
       "return_url":"https://store-alpha.example/thanks",
       "cancel_url":"https://store-alpha.example/cart"}'