web services - How to fetch some data from a webService to our Activity in android../ -

i working on project have use existing web sevice(a payment gateway provided third party vendor) through android app.

my problem after payment procedure done. want return data(transaction id , date) activity order placement can confirmed.`

the webservice loaded of webview browser using loadurl(uri url) method.

(given have no access code of webservice how fetch data activity).

please provide me appropriate solution.

edit:

webpages corresponded payement gateway webservice exists , loading them through webview.

now 4 webpages traversed , payement procedure done want send data host activity.