Reformat code.
Unused global variable $user.
Unused variable $payment_status.
Unused variable $payer_email.
Unused variable $payer_email.
Variable $answer is undefined.
Unused variable $res.
Comments.
A comma should follow the last multiline array item.
Line indented incorrectly; expected 4 spaces, found 6.
A comma should follow the last multiline array item.
Constants.
Port function drupal_http_request() to Drupal 7.
Merge with master branch.
Merge pull request #24 from DrupalCodeReview/code_standard_pg_paypal

Code standard "pg_paypal".