How to Add Text to PDF in Salesforce Apex using PDF.co

Step 1: Create Remote Site Settings

Create two remote site settings in the Salesforce Org like below.

Please note that the URL is “https://api.pdf.co”.

Please note that the URL is “https://pdf-temp-files.s3.amazonaws.com”.

Step 2: Create Apex Class in Salesforce

Create an apex class in Salesforce like below and paste the code there. Once you log in to the Salesforce org, you will see the screen like below and click on “Developer Console”.

Create an apex class. For this, click on “Files” then “New” then “Apex Class”.

Write the class name “Program” and click “Ok”. Now copy the Program file code in this file.

Similarly, create a new file with the name “ProgramTest” and copy the code.

Step 3: Enter API Key

In the Program file, please add the PDF.co API key by replacing the ‘”*****************************************’;.

Step 4: Verify the Code

To Verify the code, please open the execute Anonymous window and call the method like below.

Then Click on “Execute”.

Step 5: Search the Files

Now, Search Files from the “App Launcher”.

You will see the resulting PDF file there.

Step 6: Source Code Files:

AddTextToTheExistingPDF.cls

public class Program {
    
    public static void fetchDataAndCreatePDF()
    {
        String API_KEY = '*****************************************';       
        string SourceFileUrl = 'https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/pdf-edit/sample.pdf';
        string Pages = '';
        string Password = '';
        String DestinationFile = 'result';
        string Type = 'annotation';
        Integer X = 400;
        Integer Y = 600;
        string Text = 'APPROVED';
        string FontName = 'Times New Roman';
        Decimal FontSize = 24;
        string FontColor = 'FF0000';
        Map<string, Object> parameters = new Map<string, Object>();
        parameters.put('name', DestinationFile);
        parameters.put('password', Password);
        parameters.put('pages', Pages);
        parameters.put('url', SourceFileUrl);
        parameters.put('type', Type);
        parameters.put('x', X);
        parameters.put('y', Y);
        parameters.put('text', Text);
        parameters.put('fontname', FontName);
        parameters.put('size', FontSize);
        parameters.put('color', FontColor);
        
        string jsonPayload = Json.serialize(parameters);
        try
        {
            string url = 'https://api.pdf.co/v1/pdf/edit/add';
            HttpRequest req = new HttpRequest();
            req.setBody(jsonPayload);
            req.setHeader('x-api-key', API_KEY);
            req.setHeader('Content-Type', 'application/json');
            req.setEndpoint(url);
            req.setMethod('POST');
            req.setTimeout(60000);
            Http http = new Http();
            HTTPResponse res = http.send(req);
            if(res.getStatusCode() == 200) 
            {
                System.Debug('res ' + res);
                Map<String, Object> deserializedBody =  (Map<String, Object>)JSON.deserializeUntyped(res.getBody());
                String urlVal = (String)deserializedBody.get('url');
                downloadPDFAndStore(urlVal, DestinationFile);
            }
            else
            {
                System.debug('Success Response ' + res.getBody());
                System.Debug(' Status ' + res.getStatus());
                System.Debug(' Status Code' + res.getStatusCode());
                System.Debug(' Status String' + res.toString());
            }
           
        }
        catch(Exception ex)
        {
            String errorBody = 'Message: ' + ex.getMessage() + ' -- Cause: ' + ex.getCause() + ' -- Stacktrace: ' + ex.getStackTraceString();
            System.Debug(errorBody);
        }
    }

    @TestVisible
    private static void downloadPDFAndStore(String extFileUrl, String DestinationFile)
    {
        try
        {
            Http h = new Http(); 
            HttpRequest req = new HttpRequest(); 
            extFileUrl = extFileUrl.replace(' ', '%20'); 
            req.setEndpoint(extFileUrl); 
            req.setMethod('GET'); 
            req.setHeader('Content-Type', 'application/pdf'); 
            req.setCompressed(true); 
            req.setTimeout(60000); 
            //Now Send HTTP Request
            HttpResponse res  = h.send(req); 
            if(res.getStatusCode() == 200) 
            {
                blob fileContent = res.getBodyAsBlob();
                ContentVersion conVer = new ContentVersion();
                conVer.ContentLocation = 'S'; // to use S specify this document is in Salesforce, to use E for external files
                conVer.PathOnClient = DestinationFile + '.pdf'; // The files name, extension is very important here which will help the file in preview.
                conVer.Title = DestinationFile; // Display name of the files
                conVer.VersionData = fileContent;
                insert conVer;
                System.Debug('Success');
            }
            else
            {
                System.debug('Success Response ' + res.getBody());
                System.Debug(' Status ' + res.getStatus());
                System.Debug(' Status Code' + res.getStatusCode());
                System.Debug(' Status String' + res.toString());
            }
        }
        catch(Exception ex)
        {
            String errorBody = 'Message: ' + ex.getMessage() + ' -- Cause: ' + ex.getCause() + ' -- Stacktrace: ' + ex.getStackTraceString();
            System.Debug(errorBody);
        }
    }
}

AddTextToTheExistingPDFTest.cls

@isTest
public class ProgramTest
{
    private  testmethod static void testFetchDataAndCreatePDF()
    {
        Test.setMock(HttpCalloutMock.class, new ProgramTest.DocumentCreationMock());
        Program.fetchDataAndCreatePDF();
        List cv = [select Id from ContentVersion];
        System.assertEquals(1, cv.size());
    }

    private  testmethod static void testFetchDataAndCreatePDFException()
    {
        Program.fetchDataAndCreatePDF();
        List cv = [select Id from ContentVersion];
        System.assertEquals(0, cv.size());
    }
    
    private  testmethod static void testdownloadPDFAndStoreException()
    {
        Program.downloadPDFAndStore(null, null);
        List cv = [select Id from ContentVersion];
        System.assertEquals(0, cv.size());
    }

    public class DocumentCreationMock implements HttpCalloutMock {
        public HTTPResponse respond(HTTPRequest req) {
            HttpResponse res = new HttpResponse();
            String testBody = '{"hash":"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855","url":"https://pdf-temp-files.s3-us-west-2.amazonaws.com/0c336bfcef1a473d98492bda25d8da03/newDocument.pdf?X-Amz-Expires=3600&x-amz-security-token=FwoGZXIvYXdzEO7%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaDHWK1dY4d4lOgsheliKBATwE%2FZewASPTEnPxTn%2BOdYhP4h3gljAJfqbRvQptDX7wdWLmrBS7Tg4qTU6pAbxIdXChGPjBWpSbtiADJKmqkmyhkUmE8GSM1%2FGtJO6bga2pgzvFLXmzxjTf3%2BFNqwYOvbyApIZdVLoPpEKY6PlCflQtLTd30dhelm6xpB8pitbdhSjdz8KCBjIobVy%2Fjwybwp6OQgB%2FT6QkIo2dU07gtFREdn5jhRyvnS5lkccweBV1%2Bw%3D%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=ASIA4NRRSZPHMV5P3JOS/20210316/us-west-2/s3/aws4_request&X-Amz-Date=20210316T124309Z&X-Amz-SignedHeaders=host;x-amz-security-token&X-Amz-Signature=95287bf3c007fed4c2c5aeea1ce75c846cc6c68b22aaf35175ebe41a105f54e1","pageCount":1,"error":false,"status":200,"name":"newDocument","remainingCredits":9913694,"credits":3}';
            res.setHeader('Content-Type', 'application/json');
            res.setBody(testBody);
            res.setStatusCode(200);
            return res;
        }
    }
}