Security Header question

Hello,
Hopefully I can explain the issue clearly.

In my projects I have specified the security credentials at the interface level.

However, now the credential structure is changes such that the security headers is specified in each web service method rather than at the web service interface.

old method:

 

 
     
       
       
           
            gero et
            sonoras imperio
            quae divum incedo
       
     
 


new method:

 

     
        verrantque per auras
        per auras
     
 

 
     
       
       
           
            gero et
            sonoras imperio
            quae divum incedo
       
     
 


My question what would be the easiest way to refactor my existing scripts so that each testrequest includes this new 'AuthHeader'


Thanks

Ali