Twinfield every SOAP request failed - soap

Question

Before this project I never worked with SOAP. So I followed all of the instructions from: https://wktaaeu.force.com/nlcommunity/s/article/Setting-up-OAuth-2-0-Introduction?language=en_US and used the Postman templates on that page to make SOAP requests.
After a while I got the Access Token and company code, but I can't find out how to make other requests. With every request that I try to make from different sources on the internet I get the following error:
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body>
<soap:Fault>
<faultcode>soap:Server</faultcode>
<faultstring>Server was unable to process request. ---> Object reference not set to an instance of an object.</faultstring>
<detail />
</soap:Fault>
</soap:Body>
</soap:Envelope>
Im making a mistake why every request fails but I can't figure it out.
Examples of different requests I tried
This one I took from: Postman Twinfield API request deleted transactions
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<h:Authentication xmlns:h="http://www.twinfield.com/" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<AccessToken xmlns="http://schemas.datacontract.org/2004/07/Twinfield.WebServices.Shared">ACCESS_TOKEN</AccessToken>
<CompanyCode xmlns="http://schemas.datacontract.org/2004/07/Twinfield.WebServices.Shared">35f3248f-46cc-4a8e-b16c-69ac65118771</CompanyCode>
</h:Authentication>
</s:Header>
<s:Body>
<Query i:type="b:GetDeletedTransactions" xmlns="http://www.twinfield.com/" xmlns:a="http://schemas.datacontract.org/2004/07/Twinfield.WebServices" xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:b="http://schemas.datacontract.org/2004/07/Twinfield.WebServices.DeletedTransactionsService">
<b:CompanyCode>COMPANY_CODE</b:CompanyCode>
<b:DateFrom>2022-01-01T00:00:00</b:DateFrom>
<b:DateTo>2022-12-31T23:59:00</b:DateTo>
<b:Daybook></b:Daybook>
</Query>
</s:Body>
</s:Envelope>
Second try was by myself from the docs:
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:twin="http://www.twinfield.com/">
<soapenv:Header>
<twin:Header>
<twin:AccessToken>ACCESS_TOKEN</twin:AccessToken>
</twin:Header>
</soapenv:Header>
<soapenv:Body>
<twin:ProcessXmlString>
<twin:xmlRequest><![CDATA[<list><type>offices</type></list>]]></twin:xmlRequest>
</twin:ProcessXmlString>
</soapenv:Body>
</soapenv:Envelope>
Last one also made by my reading the docs:
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:twinfield="http://www.twinfield.com/">
<soap:Header>
<twinfield:Header>
<twinfield:AccessToken>ACCESS_TOKEN</twinfield:AccessToken>
<twinfield:CompanyCode>COMPANY_CODE</twinfield:CompanyCode>
</twinfield:Header>
</soap:Header>
<soap:Body>
<twinfield:ProcessXmlDocument>
<twinfield:xmlRequest>
<read>
<type>dimensions</type>
<office>COMPANY_CODE</office>
<dimtype>SALARIS</dimtype>
<code>1234</code>
</read>
</twinfield:xmlRequest>
</twinfield:ProcessXmlDocument>
</soap:Body>
</soap:Envelope>

Answer 1

I'v had the same struggle as you are going through, after a while I contacted Twinfield about this and they offered me a slightly different soap xml, this is no where explained nor noted down but it worked so maybe it will work for you as well:
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<h:Authentication xmlns:h="http://www.twinfield.com/" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<AccessToken xmlns="http://schemas.datacontract.org/2004/07/Twinfield.WebServices.Shared">{{Accescode}}</AccessToken>
<CompanyCode xmlns="http://schemas.datacontract.org/2004/07/Twinfield.WebServices.Shared">{{Company}}</CompanyCode>
</h:Authentication>
</s:Header>
<s:Body>
<Query i:type="b:GetDeletedTransactions" xmlns="http://www.twinfield.com/" xmlns:a="http://schemas.datacontract.org/2004/07/Twinfield.WebServices" xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:b="http://schemas.datacontract.org/2004/07/Twinfield.WebServices.DeletedTransactionsService">
<b:CompanyCode>{{Company}}</b:CompanyCode>
<b:DateFrom>2022-06-01T00:00:00</b:DateFrom>
<b:DateTo>2022-07-30T23:59:00</b:DateTo>
<b:Daybook></b:Daybook>
</Query>
</s:Body>
</s:Envelope>
As you can see there a few parameters that you need to set the "Company" and the "Access code"
for the company list I've been using this xml request:
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:twin="http://www.twinfield.com/">
<soapenv:Header>
<twin:Header>
<twin:AccessToken>{{Accescode}}</twin:AccessToken>
</twin:Header>
</soapenv:Header>
<soapenv:Body>
<twin:ProcessXmlString>
<twin:xmlRequest><![CDATA[<list><type>offices</type></list>]]></twin:xmlRequest>
</twin:ProcessXmlString>
</soapenv:Body>
</soapenv:Envelope>
if these dont work it might be that your licence within the twinfield environment needs to be adjusted so you've access to this.