Rudimentary sketch for a payment terminal for the https://makerspaceleiden.nl/
Examples:
a. Pay for your beer or coffeee https://wiki.makerspaceleiden.nl/mediawiki/index.php/Payment_Terminal_with_4_seven_segment_displays b. Pay for your heating https://wiki.makerspaceleiden.nl/mediawiki/index.php/NodeSpotHeating c. Pay for things like wine, nuts, bolts, welding gas, etc https://wiki.makerspaceleiden.nl/mediawiki/index.php/Payment_Terminal_with_TFT_screen
How it al works https://wiki.makerspaceleiden.nl/mediawiki/index.php/SpaceTegoed
See https://github.com/dirkx/makerspaceleiden-payment-node-7segments/blob/main/schematic-7seg.pdf for a schematic and https://vimeo.com/manage/videos/625531264 for the thing in use.