Patch-Klarna_Base-fix-round-to-int-and-tax-calculation.patch

--- Helper/DataConverter.php	2020-02-07 19:50:46.000000000 +0300
+++ Helper/DataConverter.php	2020-02-27 14:17:19.150006124 +0300
@@ -21,7 +21,7 @@
      */
     public function toApiFloat($float)
     {
-        return round($float * 100);
+        return (int) round($float * 100);
     }

     /**

--- Model/Checkout/Orderline/Items/Discount.php	2020-02-07 19:50:46.000000000 +0300
+++ Model/Checkout/Orderline/Items/Discount.php	2020-02-28 11:12:19.656878831 +0300
@@ -155,10 +155,10 @@
         );
         $total = $totals['discount'];

-        $parameter->setDiscountUnitPrice(-$this->helper->toApiFloat($discount['unit_price']))
-            ->setDiscountTaxRate($this->helper->toApiFloat($discount['tax_rate']))
-            ->setDiscountTotalAmount(-$this->helper->toApiFloat($discount['total_amount']))
-            ->setDiscountTaxAmount(-$this->helper->toApiFloat($discount['tax_amount']))
+        $parameter->setDiscountUnitPrice(-$discount['unit_price'])
+            ->setDiscountTaxRate($discount['tax_rate'])
+            ->setDiscountTotalAmount(-$discount['total_amount'])
+            ->setDiscountTaxAmount(-$discount['tax_amount'])
             ->setDiscountTitle((string)$total->getTitle())
             ->setDiscountReference($total->getCode());

--- Model/Calculator/Discounts.php	2020-02-07 19:50:46.000000000 +0300
+++ Model/Calculator/Discounts.php	2020-02-28 10:09:44.852988400 +0300
@@ -72,7 +72,21 @@
      */
     public function getDiscountTaxAmount($items, $total, $taxRate)
     {
-        return -($total->getValue() - ($total->getValue() / (1 + $taxRate)));
+        $taxAmount = 0;
+        foreach ($items as $item) {
+            if ($item->getBaseDiscountAmount() == 0) {
+                continue;
+            }
+            $taxAmount += $item->getDiscountTaxCompensationAmount();
+        }
+
+        if ($taxAmount === 0) {
+            if ($taxRate > 1) {
+                $taxRate = $taxRate / 100;
+            }
+            $taxAmount = -($total->getValue() - ($total->getValue() / (1 + $taxRate)));
+        }
+        return $taxAmount;
     }

     /**
@@ -194,14 +208,17 @@

         if ($this->klarnaConfig->isSeparateTaxLine($store) || $this->isTaxBeforeDiscount($store)) {
             $taxRate = 0;
-            $taxAmount = 0;
         } elseif ($this->isPriceExcludesVat($store)) {
             $unitPrice += $taxAmount;
             $totalAmount += $taxAmount;
         }
+        $taxRate = $this->dataConverter->toApiFloat($taxRate);
+        $totalAmount = $this->dataConverter->toApiFloat($totalAmount);
+        //recalculate tax amount to match rounded rate and total amount
+        $taxAmount = (int) round($totalAmount - $totalAmount * 10000 / (10000 + $taxRate));

         return [
-            'unit_price' => $unitPrice,
+            'unit_price' => $this->dataConverter->toApiFloat($unitPrice),
             'total_amount' => $totalAmount,
             'tax_rate' => $taxRate,
             'tax_amount' => $taxAmount