Designing an API in Java for a website selling vouchers

Avg Bid (USD)
Project Budget (USD)
$100 - $300

Project Description:
We need a simple website built that only does check people out by selling vouchers to them.
Buyers can choose the value of the voucher they are buying from a drop-down menu and pay through the installed payment gateway, then the buyer can use the received voucher as a payment method in the participating websites, which will be connected to the mentioned website through the API provided to them.

We need well-established developers with high ratings for this job.

Skills required:
Java, Software Architecture
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