Sale Conversion Code

1. Login to Google Adwords https://adwords.google.com/ 
2. Click on Setting at the top right menu
3. Under Measurements, Click Conversions
4. Click Add New
5. Select Website
6. Enter Conversion name
7. Choose category Purchase/Sale
8. Choose Value : Use different values for each conversion
9. Set Default value to 1
10. Choose Count : Every
11. Click create and continue
12. Copy the code paste accorndingly in to the extension fields

Note: Select Page Load for Event Snippet

More References:

1. https://support.google.com/adwords/answer/1722054?hl=en