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We had the same problem but the HOA installed a cell phone repeater/extender on the roof. It was like $200, one time purchase, works great.

Also the washers and dryers take quarters too but that can be a pain too

If they are willing to go so far as to install repeaters, why not a credit card reader?

I wonder if whole thing is bought SaaS. So it is up to provider to get it to work.

WaaS (Washing as a Service)

They don't want to deal with credit card fraud and pci compliance when everyone can use the service on their phone or get quarters