Java

PayPal Generate QR Code

See more PayPal Examples

Generates a QR code for an invoice, by ID.

The QR code is a PNG image in Base64-encoded format that corresponds to the invoice ID.

Note: A QR code can only be generated for an invoice that has been both created and sent.

See also Generate QR Code

Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Rest;
import com.chilkatsoft.chilkat2.StringBuilder;

public class ChilkatExample {

    public static void main(String[] args) {
        // Note: Requires Chilkat v9.5.0.64 or greater.

        // This requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        // Load our previously obtained access token. (see PayPal OAuth2 Access Token)
        JsonObject jsonToken = new JsonObject();
        jsonToken.loadFile("qa_data/tokens/paypal.json");

        // Build the Authorization request header field value.
        StringBuilder sbAuth = new StringBuilder();
        // token_type should be "Bearer"
        sbAuth.append(jsonToken.stringOf("token_type"));
        sbAuth.append(" ");
        sbAuth.append(jsonToken.stringOf("access_token"));

        // Make the initial connection.
        // A single REST object, once connected, can be used for many PayPal REST API calls.
        // The auto-reconnect indicates that if the already-established HTTPS connection is closed,
        // then it will be automatically re-established as needed.
        Rest rest = new Rest();
        boolean bAutoReconnect = true;
        try {
            rest.connect("api.sandbox.paypal.com", 443, true, bAutoReconnect);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // ----------------------------------------------------------------------------------------------
        // The code above this comment could be placed inside a function/subroutine within the application
        // because the connection does not need to be made for every request.  Once the connection is made
        // the app may send many requests..
        // ----------------------------------------------------------------------------------------------

        // Build a path using an invoice ID.
        StringBuilder sbPath = new StringBuilder();
        sbPath.append("/v1/invoicing/invoices/invoice_id/qr-code");
        int numReplacements = sbPath.replace("invoice_id", "INV2-ZG2H-HKAW-PMWU-N6ZR");

        rest.addHeader("Authorization", sbAuth.getAsString());
        // A 500x500 image results in a PNG file of approx. 4K bytes in size.
        rest.addQueryParam("width", "500");
        rest.addQueryParam("height", "500");
        rest.addQueryParam("action", "pay");

        // Send the GET request and get the PNG image data as base64.
        // A successful JSON response looks like this:
        // {"image":"iVBORw0KGgoAA....AASUVORK5CYII="}
        StringBuilder sbJsonResponse = new StringBuilder();
        try {
            rest.fullRequestNoBodySb("GET", sbPath.getAsString(), sbJsonResponse);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        JsonObject json = new JsonObject();
        json.setEmitCompact(false);
        json.loadSb(sbJsonResponse);

        System.out.println("Response Status Code = " + rest.getResponseStatusCode());

        // Did we get a 200 success response?
        if (rest.getResponseStatusCode() != 200) {
            System.out.println(json.emit());
            System.out.println("Failed.");
            return;
        }

        // If the 200 response is received, the response body contains the PNG data.
        // Save the PNG to a file.
        BinData pngData = new BinData();
        pngData.appendEncoded(json.stringOf("image"), "base64");
        try {
            pngData.writeFile("qa_output/paypal_qr_code.png");
        } catch (ChilkatException e) {
            System.out.println("Failed to save PNG file.");
            return;
        }

        System.out.println("Success.");
    }
}