Refactoring, part 2#3

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isdn wants to merge 6 commits intoxpayments:masterfrom

Commits on Jul 6, 2023

added json type alias
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Commits on Jul 10, 2023

Commits on Jul 11, 2023

check if list elements are not None, just in case
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Commits on Jul 15, 2023

better readability
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