No prices when showing all articles from selected category

[ghost]

Hi,
with the current git version of the extension there is following problem:

When showing all articles of a selected category there are no prices delivered from the API.
If you select certain articles to be shown it works.

Another bug: In Classes\Backend\Hooks\PageLayoutViewDraw.php there's the line "use TYPO3\CMS\Core\Service\FlexFormService;". This works in TYPO3 9 but throws an error in TYPO3 8 where we need "TYPO3\CMS\Extbase\Service\FlexFormService"

Kind regards