Step 1-Login as Admin

Step 2- Select "Financial Module", select "Fees" module

Step 3- Click on "Fee Reports" and click on "Online Fee Transaction"

Step 4- Select "Pending" option and "Date" range and click on 'Search' button

Step 5- Mark desired transactions and click on 'Bulk Status" button 

Step 6- Find all Total, Successful and Failure transactions report

NOTE-you can also find failure transactions reason by clicking on 'Total failure no.'