TYPO3 v11 PHP 81 support and PayPal rebatt amount#28

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krausandre wants to merge 8 commits intoextcode:mainfrom

krausandre:typo3-v11-php-81

Commits on Feb 24, 2022

[FIX] Establish basic compatibility for TYPO3 v11
krausandre
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Commits on Apr 25, 2022

Commits on Mar 17, 2023

[WIP] compatibility with TYPO3 v11 and PHP v8.1
krausandre
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