test add vouchers and shared service

pkg/voucher/service.go

@@ -0,0 +1,32 @@
+package voucher
+
+import "math"
+
+type Rule struct {
+	Type  string `json:"type"`
+	Value int64  `json:"value"`
+}
+
+type Voucher struct {
+	Code     string `json:"code"`
+	Value    int64  `json:"discount"`
+	TaxValue int64  `json:"taxValue"`
+	TaxRate  int    `json:"taxRate"`
+	rules    []Rule `json:"rules"`
+}
+
+type Service struct {
+	// Add fields here
+
+}
+
+func (s *Service) GetVoucher(code string) (*Voucher, error) {
+	value := int64(math.Round(100 * math.Pow(10, 2)))
+	return &Voucher{
+		Code:     code,
+		Value:    value,
+		TaxValue: int64(float64(value) * 0.2),
+		TaxRate:  2500,
+		rules:    nil,
+	}, nil
+}