Added OTHER Payment to HeroJSON to represent unknown payment options.
Added detailed HeroJSON specification
Added payments array. One receipt can now have multiple payment methods
Added customAttributes to payment
Added subName for Merchant branch
Added unitPriceincVATDecimal to product to support more than 2 decimals
Added Merchant API Details (one endpoint) and updated HeroJSON to support multiple VATs per product, discounts, freeText fields
Beginning of docs 🎵
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