* adds safeguard to prevent empty giftcard transactions on giftcards of value 0.00
* implement giftcard payment via order create
* styling
* let create_transactions() handle all the mailing
* docs
* provide more context for failed transactions
* documentation lectoring
* reject duplicate gift card secrets
* make payment_provider and use_gift_cards exclusive
* handle unknown gift cards
* Apply suggestion from @pajowu
Co-authored-by: pajowu <engelhardt@pretix.eu>
* Update src/pretix/control/templates/pretixcontrol/giftcards/payment.html
Co-authored-by: pajowu <engelhardt@pretix.eu>
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Co-authored-by: pajowu <engelhardt@pretix.eu>
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