InstaBuy + MinMaxify

  <script>
    window.InstaBuy = window.InstaBuy || {}
    window.InstaBuy.target = "_self"
    window.InstaBuy.afterRender = function(el) {
      var quantityInputs = el.querySelectorAll(".widget-quantity-input:not(.minmaxify)");
      for(var i = 0; i < quantityInputs.length; i++) {
        var input = quantityInputs[i]
        if(!input.dataset.productHandle || input.dataset.productHandle.length === 0) { continue }
        var limits = minMaxify && minMaxify.getIndividualLimitsFor && minMaxify.getIndividualLimitsFor({handle: input.dataset.productHandle});
        if(limits) {
        input.className = input.className + ' minmaxify'
          input.min = limits.min
          if(limits.max > 0) { input.max = limits.max }
          input.step = limits.multiple
          if(limits.min || limits.multiple) { input.value = limits.min || limits.multiple}
          input.dispatchEvent(new Event("input"))
        }
      }
    }
  </script>