Esp32 based point of sales system, for the danish payment provider called mobilepay.
Mobilepay is a phone based payment system, where a client photograph a QR code within the mobilepay app to provide a payment.
The paied amount will be fixed within the esp32 code.
When a payment is sent, the esp32 should receive a confirmation via REST api, and then give out x amount of pulses to fake a coin signal in machines and alike, we have access to the sandbox by mobilepay, and are fully ready.
Mobilepay documentation is on the link below:
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What you need to look at is the Mobilepay (Point of sale) API, this is what your firmware must be communicating with here.
A bt iBeacon might be needed in order to complete this.
But in short, we need a working pcs of firmware, before anything milestone is paid out, and what you bid is what you get so dont ask for more then you bid.
ALSO read the above dokumentation, might be some things i left out.
For the right freelancer, this job should be pretty easy, but dont bid if you did not atleast skim the dokumentation Please!