APEX

global class DynamoBatchApiExample {

  public static void sendRequest()
  {
     Account[] records = [SELECT Id FROM Account LIMIT 2];
  
     List<String> sObjectIds = new List<String>();
     for (SObject r : records) {
       String id = (String) r.get('Id');
       sObjectIds.add(id);
     }
    
     String templateID = 'XXXX';
     String apiKey = 'YYYY';
     String bodyJson = buildBody(templateID,sObjectIds);

     String resultJson = sendRequest(bodyJson,apiKey,null); 
     
     System.debug(resultJson);
  } 
  
  public static String sendRequest(String bodyJson,String apiKey,String endPoint) 
  {
    HttpRequest req = new HttpRequest();
    
    if (String.isBlank(endPoint))
      endPoint = 'https://dynamo-api.documill.com/v1/batch';
      
    req.setEndpoint(endPoint);
    req.setMethod('POST');
    req.setTimeout(120000);
     
    req.setHeader('x-dynamo-tenant-id', UserInfo.getOrganizationId());
    req.setHeader('x-dynamo-api-key', apiKey); 
    req.setHeader('Content-Type', 'application/json');  
     
    req.setBody(bodyJson);   
    Http http = new Http();
    HTTPResponse res = http.send(req);
    
    return res.getBody();
  }
  
  private static String buildBody(String templateID, List<String> sObjectIds) 
  {
    String partnerServerURL = URL.getOrgDomainUrl().toExternalForm() + '/services/Soap/u/50.0/' + UserInfo.getOrganizationId();
  
    List<String> l = new List<String>();
    
    l.add('{');
    l.add('"template" : "' + templateID + '",');
    l.add('"tasks" : [');
    Integer i = 0; 
    for (String sid : sObjectIds) {
      l.add('{');
      l.add('"params" : {');
      l.add('"id" : "' + sid + '"');
      l.add('}');
      l.add('}');
      if(++i < sObjectIds.size()){
        l.add(',');
      }
    }
    l.add('],');
    l.add('"integration" : {');
    l.add('"type" : "Salesforce",');
    l.add('"sessionID" : "' + UserInfo.getSessionId() + '",');
    l.add('"serverURL" : "' + partnerServerURL + '"');
    l.add('}');
    l.add('}');
    
    String body = String.join(l,'');
    return body;
  }  
  
}