Start a Transaction

Once onLoginSuccess() has fired, call startTransactionFlow to begin a payment:

tapSDK.startTransactionFlow(
    this,               // context
    uniqueId,           // generated through the merchant portal
    orderId,            // your order reference
    amount,             // String, no decimal point — see note below
);

Parameter	Type	Notes
context	Context	Typically the calling Activity.
uniqueId	String	Generated through the merchant portal.
orderId	String	Your own order reference.
amount	String	No decimal point — see below.

Amount Format

caution

Amounts are strings without a decimal point, expressed in the currency's smallest unit. If the amount is 5.99, pass "599". If the amount is 599.00, pass "59900".

From here, the SDK drives the flow through TapCallback — card tap, possible signature capture, and a final result. See Flow Overview for the full event sequence, and Capture Signature if your flow requires it.

Cancelling Mid-Flow

If you need to cancel before a result comes back (e.g. the user backs out while waiting for a card tap), see Cancel a Transaction — Abort an In-Flight Transaction. To void a transaction that already completed, see Cancel a Transaction — Void a Completed Purchase.