<bindings>
      <customBinding>
        <binding name="AbcBinding" sendTimeout="00:02:45" closeTimeout="00:02:45" receiveTimeout="00:02:45">
          <textMessageEncoding messageVersion="Soap11" />
          <httpsTransport authenticationScheme="Basic" keepAliveEnabled="true" maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647" useDefaultWebProxy="false" />
        </binding>
      </customBinding>
</bindings>
<client>
      <endpoint binding="customBinding" bindingConfiguration="AbcBinding"
                contract="AbcContract" name="AbcBinding" />
</client>

var configFactoryDebit = new ConfigurationChannelFactory<AbcContract>(
                 "AbcBinding",
                 configFile,
                 "https://......:..../.../.../.../...");
var loginCredentials = new ClientCredentials();
                loginCredentials.UserName.UserName = "Username";
                loginCredentials.UserName.Password = "Password";
                configFactoryDebit.Endpoint.Behaviors.Add(loginCredentials);