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This is the minimal integration path. Call startCore once at app startup, then call startTransaction whenever you want to charge a customer.

Step 1 — Start Core at app launch

// In Application.onCreate() or your launcher Activity
Api.startCore(context, "MyApp");

Step 2 — Initiate a SALE for $10.00

Amounts are always in minor units (cents, pence, etc.). $10.00 = 1000.

HashMap<String, String> params = new HashMap<>();
params.put(Parameters.CORRELATION_ID, "order-abc-123");  // your own reference

Api.startTransaction(1000, TransactionType.SALE, params, context);

Core takes control of the UI. Your app moves to the background.

Step 3 — Receive the result in your BroadcastReceiver

case Messages.TRANSACTION_RESULT_ACTION: {
    TransactionResult result = WrapperUtils.getTransactionResultFromJson(
        intent.getStringExtra(Messages.TRANSACTION_RESULT));

    if ("00".equals(result.getTransactionResponse())) {
        // Approved — result.getAuthCode(), result.getUti(), etc.
    } else {
        // Declined
    }
    break;
}

Core broadcasts ACTION_CALLBACK after sending the result, bringing your app back to the foreground.