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I am trying to parse the response body which is in "base64 content of a file" and trying to create the attachment with the body but getting error of " Unrecognized base64 character: " I have included sample code of the response

"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.....

When i am trying to use this response body https://www.freeformatter.com/base64-encoder.html then i am able to download the pdf but getting error when trying to decode it from Sales force

Here is the code which i have written

List<Object> filesList = (List<Object>)responseMap.get('files');

                Map<String, Object> files = (Map<String, Object>)filesList.get(0);

                //String fileId = (String)files.get('id');

                string fileId='92080882-cc3c-407d-9552-63ee02064733';

                Http http = new Http();

                HttpRequest request = new HttpRequest();

                request.setEndpoint(youSignSetting[0].Base_URL__c+'/files/'+fileId+'/download');

                request.setMethod('GET');

                request.setheader('Content-Type', 'application/json; charset=UTF-8');

                request.setHeader('Accept', 'application/json');

                request.setHeader('Authorization','Bearer '+key);

                request.setTimeOut(120000);

                System.debug(' Procedure Creation '+request.getBody());

                System.debug(' Procedure Creation '+request.getEndpoint());

                System.debug(' Procedure Creation '+request.getHeader('Authorization'));

                HttpResponse response1 = http.send(request);

                if (response1.getStatusCode() == 200) {

                    String responseBody = response1.getbody();

                    //Encodingbody=EncodingUtil.base64Decode(responseBody);

string responsestring=responsebody.remove('"');

                    system.debug('Response body---->'+responseBody);

                    Attachment att = new Attachment();

                    att.ParentId = yp.ID_parent_attachment__c;

                    att.Name = yp.Name+' Attachment.pdf';

                    blob body=EncodingUtil.base64Decode(responsestring);



                    att.Body = body;



                    insert att;

                }

                else{

                    System.debug('The status code returned was not expected: ' +

                                 response1.getStatusCode() + ' ' + response1.getStatus());

                    System.debug(response1.getBody());

                }

            }

        }else{

            System.debug('#### Start Procedure Error Message => '+response.ErrorMessage);

        }

    }

}

I have reviewed many articles regarding this but unable to get any result

The content you are receiving is not Base64: it is Base64 inside JSON, which you are asking the server to provide to you. Base64 encoding uses the characters [A-Za-z0-9+/]. The backslash and quote characters shown here are not part of the Base64 encoding but the JSON wrapper around it.

You need to deserialize the JSON first, into a String, and then Base64-decode that String:

String base64Content = JSON.deserialize(response1.getBody(), String.class));

Blob body = EncodingUtil.base64Decode(base64Content);