Web services (session values redirect another web method)

Hi,

i am doing one project for web services payment details entry below

all details fill and invoke the button function wise working fine, after complete

verification code received from mobile that code enter

previous values return session id and enter verification code after process complete.

How to implement received verification code enter which scenario am using.

i know web apps well in this scenario am doing redirect verification code page.

but how can implement webs service .

please help any idea