The error below
24-May-2019 04:32:11 : Getting license information
24-May-2019 04:32:11 : Checking Accounting System Details
24-May-2019 04:32:11 : Accounting system details retrieved.
24-May-2019 04:32:11 : Accounting system = 'ACCENTIS'.
24-May-2019 04:32:12 : The content type text/html of the response message does not match the content type of the binding (text/xml; charset=utf-8). If using a custom encoder, be sure that the IsContentTypeSupported method is implemented properly. The first 1024 bytes of the response were: '<HTML><head xmlns="http://www.w3.org/1999/xhtml"><meta charset="utf-8" /><title>Accentis Enterprise Gateway</title><style>
* {
margin: 0px;
padding: 0px;
font-family: Calibri;
}
#content {
padding: 15px;
}
#banner {
background-color: lightblue;
border-bottom: 2px solid black;
padding: 10px;
width: 100%;
}
table {
padding: 10px;
}
td {
padding: 0px 20px 0px 10px;
vertical-align: top;
}
footer {
font-size: small;
color: gray;
}
</style></head><body xmlns="http://www.w3.org/1999/xhtml"><div id="banner"><img alt="Accentis" style="float:right; margin-right:30px" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAALQAAAAyCAMAAADC+gHFAAAABGdBTUEAALGPC/xhBQAAAvRQTFRF///////D///A///A///A//+//P2+/f2++fu9+Pm8+Pm89vi88fS77vK57vK66u+56e646O245+y'.
ended up being that a customer needed a small change to their standard url