It's unclear if the merchants of Yap already had an online shop. But at some point they realized what most societies realize. They needed something that everyone agrees you can use to sell your stuff online.
Each rock’s worth is based on its size and its history (where it came from). Though US dollars have now started to be used for everyday purchases on the island, rocks are still used for ceremonial transactions (during weddings, for example). Yap also uses turmeric, shells and cloth as official currency.amazing-facts-about-travel
Here you can see some rough highlights of the current development until today the 31st of March, 2021. I will not provide informations about used programming languages, libraries, IDE's or something like that, not yet at least. But one thing you can be sure of, there is no PHP at all and no 3rd-party integrations will be made. Any feature will be fully implemented in-house for reasons like safety and performance.