Xero API Link settings

Create application

Visit this URL App management – Xero
Click the new app button

Application URL should be the web address of the server
Redirect URI should be https://{serverHostName}/csp/sys/oauth2/OAuth2.Response.cls

Click on the app and then select the Configuration menu.

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Server Settings

Go to System administration -> Security -> Client, in the management portal for the server.

Click the Create Server Description button.

Issuer endpoint should be 
https://login.xero.com/identity/connect

An SSL config will be needed for this, which is selected as the SSL/TLS configuration

Click on Client Configurations for the server description just created

Click on the Create Client Configuration button.

For "Application Name", "Client name" and "Description" enter "xero-{namespance}". 
Client type should be "Confidential".
Enter the servers host name into the "Host name" text box.

Click on the "Client Credentials" tab

Enter the details shown here in the configuration section of the Xero app that was created earlier.

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API Huge ERP

 Configuration Module> Security> API Setup

Add as shown below into the API setup in the SCM module 
"xero-hugeerp" should be replaced with "xero-{namepsace}"

Tick the functions that are needed to activate the link between Huge ERP and Xero

Xero Sales Acc	Here you can specify which sales Xero items must go to
Xero COS Acc	Here you can specify which Cost of Sales Xero items must go to
Xero Division	Here you can set up your Xero Division as default
Xero Sales Rep	Here you can select a Sales Rep as a default
Set Xero Tenant	Once you have Authenticated your Debtors, Creditors and Inventory, you will need to set the Xero Tenant which is a once off setup.

Click "save" and then the "Authenticate sign in" button.

Enter the login details for your Xero company into the window that opens.