Feat: Add code snippets for Flutter and React Native

src/doc/guides/terminal-flutter/create-method-channel/config.yml

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+languages:
+  - kt

src/doc/guides/terminal-flutter/create-method-channel/index.kt

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+// other imports
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.MethodChannel
+
+class MainActivity: FlutterActivity() {
+	private val CHANNEL = "com.example.sample_registration/payment"
+	// other code snippet
+	override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+      super.configureFlutterEngine(flutterEngine)
+
+      MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL).setMethodCallHandler {
+          call, result ->
+        if (call.method == "makePayment") {
+          val amount = call.argument("amount") ?: 0
+          makePayment(amount)
+
+          result.success(transactionStatus)
+        } else {
+          result.notImplemented()
+        }
+    }
+  }
+
+	// other code snippet
+}

src/doc/guides/terminal-flutter/create-models/config.yml

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+type: single-lang
+languages:   
+  - kt

src/doc/guides/terminal-flutter/create-models/paystack-intent-response.kt

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+
+// PaystackIntentResponse.kt
+data class PaystackIntentResponse (
+    val intentKey: String,
+    val intentResponseCode: Int,
+    val intentResponse: TerminalResponse
+)

src/doc/guides/terminal-flutter/create-models/terminal-response.kt

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+
+// TerminalResponse.kt
+data class TerminalResponse(
+    val statusCode: String,
+    val message: String,
+    val data: String
+)

src/doc/guides/terminal-flutter/create-models/transaction-request.kt

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+
+// TransactionRequest.kt
+data class TransactionRequest(
+    val amount: Int,
+    val offlineReference: String?,
+    val supplementaryReceiptData: SupplementaryReceiptData?,
+    val metadata: Map<String, Any>?
+)
+
+data class SupplementaryReceiptData(
+    val developerSuppliedText: String?,
+    val developerSuppliedImageUrlPath: String?,
+    val barcodeOrQrcodeImageText: String?,
+    val textImageType: TextImageFormat?
+)
+
+enum class TextImageFormat {
+    QR_CODE,
+    AZTEC_BARCODE
+}

src/doc/guides/terminal-flutter/create-models/transaction-response.kt

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+// TransactionResponse.kt
+import com.google.gson.annotations.SerializedName
+
+data class TransactionResponse(
+    val id: String?,
+    val amount: Int?,
+    val reference: String?,
+    val status: String?,
+    val currency: String?,
+    @SerializedName("country_code")
+    val countryCode: String?,
+    @SerializedName("paid_at")
+    val paidAt: String?,
+    val terminal: String?
+)

src/doc/guides/terminal-flutter/create-payment-intent/config.yml

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+languages:
+  - kt

src/doc/guides/terminal-flutter/create-payment-intent/index.kt

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+// MainActivity.kt
+import android.content.Intent
+import android.util.Log
+import android.widget.Toast
+import com.example.sample_registration.model.CustomField
+import com.example.sample_registration.model.PaystackIntentResponse
+import com.example.sample_registration.model.TerminalResponse
+import com.example.sample_registration.model.TransactionRequest
+import com.example.sample_registration.model.TransactionResponse
+import com.google.gson.Gson
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity: FlutterActivity() {
+  private val gson = Gson()
+  private var transactionStatus: String? = ""
+
+  private val CHANNEL = "com.example.sample_registration/payment"
+  private val PACKAGE_NAME = "com.paystack.pos"
+  private val TRANSACTION = "com.paystack.pos.TRANSACT"
+  private val TRANSACTION_RESULT_CODE = 14
+
+
+  private fun makePayment(amount: Int?) {
+    val transactionRequest = amount?.let {
+      TransactionRequest(
+        amount = it,
+        offlineReference = null,
+        supplementaryReceiptData = null,
+        metadata = mapOf(
+          "custom_fields" to listOf(
+            CustomField(
+              displayName = "App Name",
+              variableName = "app_name",
+              value = "Sample Registration"
+            )
+          )
+        )
+      )
+    }
+
+    val transactionIntent = Intent(Intent.ACTION_VIEW).apply {
+      setPackage(PACKAGE_NAME)
+      putExtra(TRANSACTION, gson.toJson(transactionRequest))
+    }
+
+    startActivityForResult(transactionIntent, 1)
+  }
+
+  override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+    super.onActivityResult(requestCode, resultCode, data)
+    val paystackIntentResponse: PaystackIntentResponse
+
+    if (resultCode == TRANSACTION_RESULT_CODE) {
+      paystackIntentResponse = gson.fromJson(
+        data?.getStringExtra(TRANSACTION),
+        PaystackIntentResponse::class.java
+      )
+
+      processResponse(paystackIntentResponse)
+    }
+    else {
+      // handle invalid result code
+    }
+  }
+
+  private fun processResponse(response: PaystackIntentResponse) {
+
+    val terminalResponse: TerminalResponse = response.intentResponse
+    val transactionResponse = gson.fromJson(
+      terminalResponse.data,
+      TransactionResponse::class.java
+    )
+
+    transactionStatus = transactionResponse.reference
+  }
+}

src/doc/guides/terminal-flutter/link-method-channel/config.yml

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+languages:
+  - dart

src/doc/guides/terminal-flutter/link-method-channel/index.dart

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+static const _methodChannel =
+      MethodChannel('com.example.sample_registration/payment');
+
+Future<void> makePayment() async {
+    String reference = '';
+    try {
+      var options = {
+        'amount': 5000,
+        'supplementaryData': {
+          'developerSuppliedText': null,
+          'developerSuppliedImageUrlPath':
+              "https://assets.paystack.com/assets/img/press/Terminal-x-Bature-x-World-Cup-Receipt.jpg",
+          'barcodeOrQrcodeImageText': null,
+          'textImageType': null
+        }
+      };
+      reference = await _methodChannel.invokeMethod('makePayment', options);
+      print("Reference: $reference");
+    } on PlatformException catch (e) {
+      print("Error: $e");
+      reference = '';
+    }
+
+    setState(() {
+      _transactionReference = reference;
+    });
+  }

src/doc/guides/terminal-react-native/create-models/config.yml

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+type: single-lang
+languages:   
+  - java

src/doc/guides/terminal-react-native/create-models/paystack-intent-response.java

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+
+// PaystackIntentResponse.java
+public class PaystackIntentResponse {
+  private final String intentkey;
+  private final int intentResponseCode;
+  private final TerminalResponse intentResponse;
+
+  public PaystackIntentResponse(String intentkey, int intentResponseCode, TerminalResponse intentResponse) {
+    this.intentkey = intentkey;
+    this.intentResponseCode = intentResponseCode;
+    this.intentResponse = intentResponse;
+  }
+
+  public String getIntentkey() {
+    return intentkey;
+  }
+
+  public int getIntentResponseCode() {
+    return intentResponseCode;
+  }
+
+  public TerminalResponse getIntentResponse() {
+    return intentResponse;
+  }
+}

src/doc/guides/terminal-react-native/create-models/terminal-response.java

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+
+// TerminalResponse.java
+public class TerminalResponse {
+  private final String statusCode;
+  private final String message;
+  private final String data;
+
+  public TerminalResponse(String statusCode, String message, String data) {
+    this.statusCode = statusCode;
+    this.message = message;
+    this.data = data;
+  }
+
+  public String getStatusCode() {
+    return statusCode;
+  }
+
+  public String getMessage() {
+    return message;
+  }
+
+  public String getData() {
+    return data;
+  }
+}

src/doc/guides/terminal-react-native/create-models/transaction-request.java

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+
+// TransactionRequest.java
+import java.util.Map;
+
+public class TransactionRequest {
+  private int amount;
+  private Map<String, Object> metadata;
+
+  public TransactionRequest() {
+  }
+
+  public void setAmount(int amount) {
+    this.amount = amount;
+  }
+
+  public void setMetadata(Map<String, Object> metadata) {
+    this.metadata = metadata;
+  }
+}

src/doc/guides/terminal-react-native/create-models/transaction-response.java

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+
+// TransactionResponse.java
+import com.google.gson.annotations.SerializedName;
+
+public class TransactionResponse {
+  private final String id;
+  private final int amount;
+  private final String reference;
+  private final String status;
+  private final String currency;
+  @SerializedName("country_code")
+  private final String countryCode;
+  @SerializedName("paid_at")
+  private final String paidAt;
+  private final String terminal;
+
+  public TransactionResponse(
+      String id, int amount, String reference, String status,
+      String currency, String countryCode, String paidAt, String terminal) {
+    this.id = id;
+    this.amount = amount;
+    this.reference = reference;
+    this.status = status;
+    this.currency = currency;
+    this.countryCode = countryCode;
+    this.paidAt = paidAt;
+    this.terminal = terminal;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public int getAmount() {
+    return amount;
+  }
+
+  public String getReference() {
+    return reference;
+  }
+
+  public String getStatus() {
+    return status;
+  }
+
+  public String getCurrency() {
+    return currency;
+  }
+
+  public String getCountryCode() {
+    return countryCode;
+  }
+
+  public String getPaidAt() {
+    return paidAt;
+  }
+
+  public String getTerminal() {
+    return terminal;
+  }
+}

src/doc/guides/terminal-react-native/create-module/paystack-module-callback/config.yml

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+languages:
+  - java

src/doc/guides/terminal-react-native/create-module/paystack-module-callback/index.java

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+import android.app.Activity;
+import android.content.Intent;
+
+import com.facebook.react.bridge.ActivityEventListener;
+import com.facebook.react.bridge.BaseActivityEventListener;
+import com.facebook.react.bridge.Callback;
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.bridge.ReactContextBaseJavaModule;
+import com.google.gson.Gson;
+
+public class PaystackModule extends ReactContextBaseJavaModule {
+
+  private final Gson gson = new Gson();
+  private Callback mCallback;
+
+  private final ActivityEventListener mActivityEventListener = new BaseActivityEventListener() {
+    @Override
+    public void onActivityResult(Activity activity, int requestCode, int resultCode, Intent data) {
+      PaystackIntentResponse paystackIntentResponse;
+      TerminalResponse terminalResponse;
+
+      paystackIntentResponse = gson.fromJson(
+          data != null ? data.getStringExtra("com.paystack.pos.TRANSACT") : null,
+          PaystackIntentResponse.class);
+      terminalResponse = paystackIntentResponse.getIntentResponse();
+      TransactionResponse transactionResponse = gson.fromJson(
+          terminalResponse.getData(),
+          TransactionResponse.class);
+      mCallback.invoke(transactionResponse.getReference());
+    }
+  };
+
+  // the rest of the code previously added
+}

src/doc/guides/terminal-react-native/create-module/paystack-module-final/config.yml

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+languages:
+  - java