Merge branch 'hotfix/2.6.4'
Merge remote-tracking branch 'origin' into develop
invoice admin
partpayment admin
card admin
directbank admin
invoice checkout display
paymentplan checkout display
card checkout display
directbank checkout display
response card
response directbank
Response handling
bump to version 3.0.0
Merge branch 'feature/opencart-2-compatibility' into develop