Typo error in date_modified field in api table
Merge pull request #1581 from psramkumar/master

Typo error in date_modified field in api table
more api work done
Fixed 'option_value' key in payment/pp_express.php -> changed to 'value' in 2.0.
ore api work done
Merge branch 'master' of https://github.com/opencart/opencart