This article is part of the article serie 
Setting up OAuth 2.0 - IntroductionYou can import data into Twinfield or extract data from Twinfield by posting an request. Twinfield will only accept your request if you send along a valid access token. If you don't have one please refer to the previous step: 
Request an access tokenTwinfield has multiple clusters to which you can post an request. Each end user is assigned to a specific cluster. Posting to the wrong cluster will result in an error. Please read this article to determine which cluster you need: 
Which cluster do I need for my request?To send an request you need to send a POST request to one of Twinfield's endpoints. The endpoints looks like this:
https://
clusterUrl/webservices/processxml.asmx
Important: Replace the red part of the endpoint by the twf.clusterUrl. Please refer to this article: 
Which cluster do I need for my request?Important: In the link above you see webservices/. Behind the / is processxml.asmx. There are multiple endpoints that you can use. Each endpoint has its own name after the /. In this article you'll find an overview of the three types of web services that are available and a list of all the available endpoints: 
Which types of web services are available?Use the table below for the headers that you need to send along in your POST request. 
| Header__________ | Value | 
|---|
| Content-Type | text/xml | 
| SOAPAction | You can find a complete overview of how to use the endpoint by adding ?wsdl to the end of the url of the endpoint. For example: https://accounting2.twinfield.com/webservices/periodservice.svc?wsdl 			 			Search for "soapaction" on the wsdl-page to find the value you need. | 
In the body of your POST request you can add a soap enveloppe that contains your request.
Important: The xml tags are case sensitive.
A blank soap envelope looks like this. Note that we declare the xmlns for the soap envelope itself and for the request to Twinfield. 
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"  xmlns:twinfield="http://www.twinfield.com/"> 			    <soap:Header> 			        ... 			    </soap:Header> 			    <soap:Body> 			        ... 			    </soap:Body> 			</soap:Envelope> | 
The next step is to fill the <soap:Header>. How you need to fill it depends on the type of webservice that you're using. For the XML Web Services you'll need to use <twinfield:Header>. 
    <soap:Header> 			        <twinfield:Header> 			           ... 			        </twinfield:Header> 			    </soap:Header> | 
For the Command & Query Web Services you'll need to use <twinfield:Authentication>. 
    <soap:Header> 			        <twinfield:Authentication> 			           ... 			        </twinfield:Authentication> 			    </soap:Header> | 
What all webservices have in common is that you need to use <twinfield:AccessToken> and <twinfield:CompanyCode> within both <twinfield:Header> and <twinfield:Authentication>. In the code snippet below we show you <twinfield:Header> but it works the same for <twinfield:Authentication>. 
    <soap:Header> 			        <twinfield:Header> 			           <twinfield:AccessToken>7c944a6b#####7296a98</twinfield:AccessToken> 			           <twinfield:CompanyCode>123456</twinfield:CompanyCode> 			        </twinfield:Header> 			    </soap:Header> | 
Important: You must always send <twinfield:AccessToken> along in your soap envelope, but it depends on the situation if you need to send <twinfield:CompanyCode>. Sometimes you must add it and other times you must leave it out. Use the table below for a reference. 
| Situation____________ | Do you need to send <twinfield:CompanyCode>? | 
|---|
| You want to retrieve a list of all companies that exist in an organization | Omit the tag <twinfield:CompanyCode>. 			 			Good to know: Refer to this article to request a list of all companies in an organization:  			https://accounting.twinfield.com/webservices/documentation/#/ApiReference/Masters/Offices | 
| You want to send an request for specific company | Add <twinfield:CompanyCode> and mention the company code. | 
| You want to send an request for multiple companies | Only add <twinfield:CompanyCode> for the first company code. | 
Now that you got a basic soap envelope you can continue to the next step. This is adding content in the soap body. Use this article for this: 
Which types of web services are available?