fix(payment-stripe): fix rounding (#8753)

packages/modules/providers/payment-stripe/src/utils/__tests__/get-smallest-unit.ts

@@ -9,10 +9,13 @@ describe("getSmallestUnit", () => {
     expect(getSmallestUnit(5.124, "KWD")).toBe(5130)
 
     // 2 decimals
+    expect(getSmallestUnit(2.675, "USD")).toBe(268)
+
     expect(getSmallestUnit(100.54, "USD")).toBe(10054)
     expect(getSmallestUnit(5.126, "KWD")).toBe(5130)
     expect(getSmallestUnit(0.54, "USD")).toBe(54)
     expect(getSmallestUnit(0.054, "USD")).toBe(5)
-    expect(getSmallestUnit(0.005104, "USD")).toBe(0)
+    expect(getSmallestUnit(0.005104, "USD")).toBe(1)
+    expect(getSmallestUnit(0.004104, "USD")).toBe(0)
   })
 })

packages/modules/providers/payment-stripe/src/utils/get-smallest-unit.ts

@@ -47,10 +47,14 @@ export function getSmallestUnit(
   currency: string
 ): number {
   const multiplier = getCurrencyMultiplier(currency)
-  const smallestAmount = new BigNumber(MathBN.mult(amount, multiplier))
+
+  let amount_ =
+    Math.round(new BigNumber(MathBN.mult(amount, multiplier)).numeric) /
+    multiplier
+
+  const smallestAmount = new BigNumber(MathBN.mult(amount_, multiplier))
 
   let numeric = smallestAmount.numeric
-
   // Check if the currency requires rounding to the nearest ten
   if (multiplier === 1e3) {
     numeric = Math.ceil(numeric / 10) * 10