Support payment orders upload#25

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jusephe wants to merge 5 commits intomhujer:masterfrom

jusephe:payment-orders-upload

Commits on Jul 22, 2021

add support to upload payment orders
Josef Šupka
committed

Commits on Jul 23, 2021

change folder structure
Josef Šupka
committed

Commits on Jul 24, 2021

add unit tests + other minor tweaks
Josef Šupka
committed
update README to document uploading
Josef Šupka
committed
minor tweaks
Josef Šupka
committed