Convert a web service which has userid/password hard coded......

Hi,
We have created a web service in our ECC 5.0 abap system. In SICF we hardcoded the userid/password, the web service works fine and can be called successfully to read the required data from SAP.
Now we wish to change the process so that the users calling the web service have to pass their userid/password, now things don't work!!
How do we change things around to the new format?
Options we are considering are as follows:
1) Change the function module so that it has import parameters of userid and password (don't think this will work!)
2) Somehow update the wsdl file so that it includes userid/password, is this possible?
3) SICF/wsconfig/wsadmin config, but don't know what to do though!!
Any ideas anyone?
Thanks.

> Now we wish to change the process so that the users calling the web service have to pass their userid/password
1. Do you want to have authorize access to webservice or,
2. do you want to user supply user/password as a parameter within service.
for 1st you don't have to do anything just goto SOAMANAGER transaction and select basic http authentication for service endpoint. Every user who want to access (even url of wsdl) need to supply user/password.
for 2nd option you can integrate user/password field in FM but you need to include code which check and confirm if they are valid credential.
Regards,
gourav

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