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Call at app startup. Launches the Core application in the background, ensuring it is ready when the first transaction is needed. Avoids delays on the first payment.

Api.startCore(context);

// Optionally provide your app's name for diagnostic logs
Api.startCore(context, "MyApp");

Request the current terminal configuration. Core broadcasts CONFIG_RESULT_ACTION with a Config JSON object.

Api.requestConfig(context);

Core also sends CONFIG_RESULT_ACTION automatically at startup. See Configuration Fields for the full field list.

Update one or more runtime settings. Core reloads its configuration after applying the changes.

HashMap<String, String> params = new HashMap<>();
params.put(Parameters.PRINT_RECEIPT_SETTING, "true");
params.put(Parameters.AUDIO_SETTING, "MUTE");   // AUDIO | SILENT_KEYBOARD | MUTE
params.put(Parameters.THEME_SETTING, "DARK");   // DARK | LIGHT

Api.updateParameter(context, params);

Supported settings keys: PRINT_RECEIPT_SETTING, USE_SIGNATURE_ON_SCREEN_SETTING, AUDIO_SETTING, THEME_SETTING, MERCHANT_RECEIPT_SETTING.

Switch the active merchant. Only applicable when multi-merchant is configured. The merchantId value comes from MerchantConfig.getId(), obtained via requestConfig or getAvailableMerchants.

Api.switchMerchant(context, merchantId);

Fetch the list of merchants configured on the device. Result is broadcast as ACTION_GET_AVAILABLE_MERCHANTS_RESULT.

Api.getAvailableMerchants(context);

// In your receiver:
case Messages.ACTION_GET_AVAILABLE_MERCHANTS_RESULT: {
    String json = intent.getStringExtra(Messages.AVAILABLE_MERCHANTS_RESULT);
    List<MerchantResult> merchants = WrapperUtils.getMerchantsFromJson(json);
    break;
}

Change the device system language. This affects the language used in Core's own UI and receipts.

Api.updateLanguage(context, "sv_SE");

Update the PIN/password for a specific merchant.

Api.updateMerchantPassword(context, merchantId, newPassword);

Cycle the terminal encryption keys.

Api.cycleKeys(context);

// With locale override
HashMap<String, String> params = new HashMap<>();
params.put(Parameters.LOCALE, "en_GB");
Api.cycleKeys(context, params);

Shut down the Core application.

Api.shutdownCore(context);