This is the chapter-2 of how to integrate the PayPal standard payment gateway in your android app.

In the previous chapter, we had known how to get the API Credentials after that we to implement it in the app.

How to integrate in the app

Step 1: Get the Client_id and serect(which will be used in future) by creating the app in PayPal developer account.

For knowing, how to get the client_id and secret go to this knowledgebase.

Step 2: Make a credential class file to enter the PayPal app credentials

public class PaypalCredentials {
    public static final String CONFIG_ENVIRONMENT = PayPalConfiguration.ENVIRONMENT_SANDBOX;
    // note that these credentials will differ between live & sandbox environments.
    public static final String CONFIG_CLIENT_ID = "MERCHANT_CLIENT_ID";
    public static final int REQUEST_CODE_PAYMENT = 1;
    public static PayPalConfiguration config = new PayPalConfiguration()
            .environment(CONFIG_ENVIRONMENT)
            //For enable direct card payment.
            .acceptCreditCards(true)
            .clientId(CONFIG_CLIENT_ID)
            // The following are only used in PayPalFuturePaymentActivity.
            .merchantName("MERCHANT_NAME")
            .merchantPrivacyPolicyUri(Uri.parse("https://www.example.com/privacy"))
            .merchantUserAgreementUri(Uri.parse("https://www.example.com/legal"));
}

public class PaypalCredentials {

public static final String CONFIG_ENVIRONMENT = PayPalConfiguration.ENVIRONMENT_SANDBOX;

// note that these credentials will differ between live & sandbox environments.

public static final String CONFIG_CLIENT_ID = "MERCHANT_CLIENT_ID";

public static final int REQUEST_CODE_PAYMENT = 1;

public static PayPalConfiguration config = new PayPalConfiguration()

.environment(CONFIG_ENVIRONMENT)

//For enable direct card payment.

.acceptCreditCards(true)

.clientId(CONFIG_CLIENT_ID)

// The following are only used in PayPalFuturePaymentActivity.

.merchantName("MERCHANT_NAME")

.merchantPrivacyPolicyUri(Uri.parse("https://www.example.com/privacy"))

.merchantUserAgreementUri(Uri.parse("https://www.example.com/legal"));

}

Step 3: Configure the PayPal service add it to your payment activity,

Intent paypalIntent = new Intent(this, PayPalService.class);
paypalIntent.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, PaypalCredentials.config);
startService(paypalIntent);

Intent paypalIntent = new Intent(this, PayPalService.class);

paypalIntent.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, PaypalCredentials.config);

startService(paypalIntent);

Step 4: Prepared checkout data with function getStuffToBuy,

private PayPalPayment getStuffToBuy(String paymentIntent) {
            //--- include an item list, payment amount details
            BigDecimal shipping = null, subtotal = null, amount = null, discount;
            try {
                JSONArray orderReviewDataArray = mainObjectForOrderReview.getJSONObject("continue").getJSONArray("products");
                if (mainObjectForOrderReview.getJSONObject("continue").has("discount")) {
                    items = new PayPalItem[orderReviewDataArray.length() + 1];
                    discount = new BigDecimal(mainObjectForOrderReview.getJSONObject("orderReviewData").getJSONObject("discount").getString("unformatedValue"));
                    int i;
                    for (i = 0; i < orderReviewDataArray.length(); i++) {
                        JSONObject paypalDetails = orderReviewDataArray.getJSONObject(i);
                        items[i] = new PayPalItem(paypalDetails.getString("name"), Integer.parseInt(paypalDetails.getString("quantity")),
                                new BigDecimal(paypalDetails.getString("uf_price")), currencyCode,
                                paypalDetails.getString("model"));
                    }
                    items[i] = new PayPalItem("Discount", 1, discount, currencyCode, "dicountsku");
                    subtotal = PayPalItem.getItemTotal(items);
                    subtotal = subtotal.add(discount);
                }
                amount = subtotal;

                if (mainObjectForOrderReview.getJSONObject("continue").getJSONObject("paypal_data").has("shipping")) {
                    shipping = new BigDecimal(mainObjectForOrderReview.getJSONObject("continue").getJSONObject("paypal_data").getString("shipping"));
                    amount = amount.add(shipping);
                }
                if (mainObjectForOrderReview.getJSONObject("continue").getJSONObject("paypal_data").has("discount")) {
                    discount = new BigDecimal(mainObjectForOrderReview.getJSONObject("continue").getJSONObject("paypal_data").getString("discount"));
                    amount = amount.add(discount);
                }
    //            if (mainObjectForOrderReview.getJSONObject("continue").getJSONObject("paypal_data").has("tax")) {
    //                tax = new BigDecimal(mainObjectForOrderReview.getJSONObject("continue").getJSONObject("paypal_data").getString("tax"));
    //                amount = amount.add(tax);
    //            }
            } catch (JSONException e) {
                Log.d("paypal Exception", e + "");
                e.printStackTrace();
            }

            PayPalPaymentDetails paymentDetails = new PayPalPaymentDetails(shipping, subtotal, null);
            payment = new PayPalPayment(amount, currencyCode, incrementId, paymentIntent);
            payment.items(items).paymentDetails(paymentDetails);
            //--- set other optional fields like invoice_number, custom field, and soft_descriptor
            payment.custom(getResources().getString(R.string.paypal_custom));
            return payment;
        }

private PayPalPayment getStuffToBuy(String paymentIntent) {

//--- include an item list, payment amount details

BigDecimal shipping = null, subtotal = null, amount = null, discount;

try {

JSONArray orderReviewDataArray = mainObjectForOrderReview.getJSONObject("continue").getJSONArray("products");

if (mainObjectForOrderReview.getJSONObject("continue").has("discount")) {

items = new PayPalItem[orderReviewDataArray.length() + 1];

discount = new BigDecimal(mainObjectForOrderReview.getJSONObject("orderReviewData").getJSONObject("discount").getString("unformatedValue"));

int i;

for (i = 0; i < orderReviewDataArray.length(); i++) {

JSONObject paypalDetails = orderReviewDataArray.getJSONObject(i);

items[i] = new PayPalItem(paypalDetails.getString("name"), Integer.parseInt(paypalDetails.getString("quantity")),

new BigDecimal(paypalDetails.getString("uf_price")), currencyCode,

paypalDetails.getString("model"));

}

items[i] = new PayPalItem("Discount", 1, discount, currencyCode, "dicountsku");

subtotal = PayPalItem.getItemTotal(items);

subtotal = subtotal.add(discount);

}

amount = subtotal;

if (mainObjectForOrderReview.getJSONObject("continue").getJSONObject("paypal_data").has("shipping")) {

shipping = new BigDecimal(mainObjectForOrderReview.getJSONObject("continue").getJSONObject("paypal_data").getString("shipping"));

amount = amount.add(shipping);

}

if (mainObjectForOrderReview.getJSONObject("continue").getJSONObject("paypal_data").has("discount")) {

discount = new BigDecimal(mainObjectForOrderReview.getJSONObject("continue").getJSONObject("paypal_data").getString("discount"));

amount = amount.add(discount);

}

// if (mainObjectForOrderReview.getJSONObject("continue").getJSONObject("paypal_data").has("tax")) {

// tax = new BigDecimal(mainObjectForOrderReview.getJSONObject("continue").getJSONObject("paypal_data").getString("tax"));

// amount = amount.add(tax);

// }

} catch (JSONException e) {

Log.d("paypal Exception", e + "");

e.printStackTrace();

}

PayPalPaymentDetails paymentDetails = new PayPalPaymentDetails(shipping, subtotal, null);

payment = new PayPalPayment(amount, currencyCode, incrementId, paymentIntent);

payment.items(items).paymentDetails(paymentDetails);

//--- set other optional fields like invoice_number, custom field, and soft_descriptor

payment.custom(getResources().getString(R.string.paypal_custom));

return payment;

}

Step 5: getStuffToBuy function return an object,

PayPalPayment thingToBuy = getStuffToBuy(PayPalPayment.PAYMENT_INTENT_SALE);

1	PayPalPayment thingToBuy = getStuffToBuy(PayPalPayment.PAYMENT_INTENT_SALE);

Step 6: After preparing the data send it to the PaymentActivity.class

Intent intent = new Intent(Checkout.this, PaymentActivity.class);
            // send the same configuration for restart resiliency
            intent.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, PaypalCredentials.config);
            intent.putExtra(PaymentActivity.EXTRA_PAYMENT, thingToBuy);
            startActivityForResult(intent, PaypalCredentials.REQUEST_CODE_PAYMENT);

Intent intent = new Intent(Checkout.this, PaymentActivity.class);

// send the same configuration for restart resiliency

intent.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, PaypalCredentials.config);

intent.putExtra(PaymentActivity.EXTRA_PAYMENT, thingToBuy);

startActivityForResult(intent, PaypalCredentials.REQUEST_CODE_PAYMENT);

Step 7: And At last get the result,

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == PaypalCredentials.REQUEST_CODE_PAYMENT) {
        if (resultCode == Activity.RESULT_OK) {
            confirm = data.getParcelableExtra(PaymentActivity.EXTRA_RESULT_CONFIRMATION);
            if (confirm != null) {
                try {
                    Log.d(TAG, confirm.toJSONObject().toString(4));
                    Log.d(TAG, confirm.toJSONObject().toString(4));
                   // receive your data
                } catch (JSONException e) {
                    Log.e(TAG, "an extremely unlikely failure occurred: ", e);
                }
            }
        } else if (resultCode == Activity.RESULT_CANCELED) {
            status = 1;
            Log.i(TAG, "The user canceled.");
        } else if (resultCode == PaymentActivity.RESULT_EXTRAS_INVALID) {
            status = 2;
            Log.i(TAG, "An invalid Payment or PayPalConfiguration was submitted. Please see the docs.");
        }
    }

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

if (requestCode == PaypalCredentials.REQUEST_CODE_PAYMENT) {

if (resultCode == Activity.RESULT_OK) {

confirm = data.getParcelableExtra(PaymentActivity.EXTRA_RESULT_CONFIRMATION);

if (confirm != null) {

try {

Log.d(TAG, confirm.toJSONObject().toString(4));

// receive your data

} catch (JSONException e) {

Log.e(TAG, "an extremely unlikely failure occurred: ", e);

}

} else if (resultCode == Activity.RESULT_CANCELED) {

status = 1;

Log.i(TAG, "The user canceled.");

} else if (resultCode == PaymentActivity.RESULT_EXTRAS_INVALID) {

status = 2;

Log.i(TAG, "An invalid Payment or PayPalConfiguration was submitted. Please see the docs.");

}

In the response, you have received a pay_id, Which is used to getting the full transaction details of payment by calling simply two API calls.

For getting the full transaction details by the pay_id in PayPal mobile payment visit our this blog.

Aman Gupta 14 December 2016

. . .

How to integrate the paypal standard payment gateway in your android app Chapter-2

How to integrate in the app

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How to integrate the paypal standard payment gateway in your android app Chapter-2

How to integrate in the app

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