The voucher plugin doesnt seem to upgrade the user, when a valid voucher code is used, its logged as used however just refreshes the page and no upgrades to premium are performed
this is from the voucher plugin log
2016-01-28 10:24:31 - Voucher code 'A8PANELN3FA2BF9UP6Z6' set as used for account #39. Array
(
[id] => 209
[0] => 209
[voucher] => A8PANELN3FA2BF9UP6Z6
[1] => A8PANELN3FA2BF9UP6Z6
[user_level_pricing_id] => 1
[2] => 1
[purchase_date] => 2016-01-28 09:10:47
[3] => 2016-01-28 09:10:47
[purchase_price] => 0.00
[4] => 0.00
[purchase_user_id] => 25
[5] => 25
[purchase_source] => user
[6] => user
[status] => available
[7] => available
[used_date] =>
[8] =>
[used_user_id] =>
[9] =>
)
this is from the voucher plugin log
2016-01-28 10:24:31 - Voucher code 'A8PANELN3FA2BF9UP6Z6' set as used for account #39. Array
(
[id] => 209
[0] => 209
[voucher] => A8PANELN3FA2BF9UP6Z6
[1] => A8PANELN3FA2BF9UP6Z6
[user_level_pricing_id] => 1
[2] => 1
[purchase_date] => 2016-01-28 09:10:47
[3] => 2016-01-28 09:10:47
[purchase_price] => 0.00
[4] => 0.00
[purchase_user_id] => 25
[5] => 25
[purchase_source] => user
[6] => user
[status] => available
[7] => available
[used_date] =>
[8] =>
[used_user_id] =>
[9] =>
)