Pass in acrValues

This allows [Bulk Connections](https://developer.xero.com/documentation/oauth2/partner-benefits#bulkconnections) to be enabled / disabled as required

Author: MatthewSteeples

Xero.NetStandard.OAuth2Client/src/Client/IXeroClient.cs

@@ -12,6 +12,7 @@ public interface IXeroClient
         string BuildLoginUri();
         string BuildLoginUri(string state);
         string BuildLoginUri(string state, string scope);
+        string BuildLoginUri(string state, string scope, string acrValues);
         string BuildLoginUriPkce(string codeVerifier);
         string BuildLoginUriPkce(string codeVerifier, string state);
         string BuildLoginUriPkce(string codeVerifier, string state, string scope);

Xero.NetStandard.OAuth2Client/src/Client/XeroClient.cs

@@ -62,18 +62,26 @@ public string BuildLoginUri(string state)
         /// <returns>A valid initial redirect URI for Xero OAuth 2.0 authorisation flow.</returns>
         public string BuildLoginUri(string state, string scope)
         {
+            return BuildLoginUri(state, scope, xeroConfiguration.AcrValues);
+        }
+
+        /// <summary>
+        /// Builds a XeroLogin URL for code flow, allows state, scope and acrValues to be passed in.
+        /// </summary>
+        /// <returns>A valid initial redirect URI for Xero OAuth 2.0 authorisation flow.</returns>
+        public string BuildLoginUri(string state, string scope, string acrValues)
+        { 
             var url = _xeroAuthorizeUri.CreateAuthorizeUrl(
                 clientId: xeroConfiguration.ClientId,
                 responseType: "code",
                 redirectUri: xeroConfiguration.CallbackUri.AbsoluteUri,
                 state: state,
-                scope: scope
+                scope: scope,
+                acrValues: acrValues
             );
             return url;
         }
 
-
-
         /// <summary>
         /// Builds a XeroLogin URL for PKCE flow with codeVerifier input
         /// </summary>

Xero.NetStandard.OAuth2Client/src/Config/XeroConfiguration.cs

@@ -11,6 +11,7 @@ public class XeroConfiguration
         public string Scope { get; set; }
         public string State { get; set; }
         public string XeroApiBaseUri { get; set; } = "https://api.xero.com";
+        public string AcrValues { get; set; }
         public string XeroLoginBaseUri { get; set; } = "https://login.xero.com";
         public string XeroIdentityBaseUri { get; set; } = "https://identity.xero.com";
     }