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JAVASCRIPT SDKv0.3.38

SDK playground.

Try it first

Compare simulated and testnet receipts#

You need A browser; no studio secret or wallet is needed for the public demo.

  1. Run an Offline request and inspect its simulated response.
  2. Select Sandbox and run a 0.01 test USDC request.
  3. Use Verify again on the returned payment ID.

Check your result You can distinguish mock output, a pending request and a fresh chain receipt.

Run SDK 0.3.38 in your browser. Start offline, then make a real testnet payment on Base Sepolia.

Request

IAP · pay → verify
Environment

Offline mode runs the actual SDK with mock enabled. It does not contact Playmos or move funds.

Response

No request yet
Run a request to see the SDK response.

Sandbox service

Checks the real SDK service, independently of the storefront API.

Each request keeps one purchase ID for retries. “New request” creates a separate test purchase. Production fulfillment must happen on your backend after verification.

If it did not work#

Rate limits or degraded reads need a later retry of the same purchase, not a new charge.

Try one variation Compare Offline and Sandbox responses. Identify the fields that distinguish simulation from chain evidence.

Continue with the next guide →