Update

internal/repository/linkqu/linkqu.go

@@ -227,3 +227,47 @@ func cleanString(s string) string {
 	reg := regexp.MustCompile("[^a-zA-Z0-9]+")
 	return strings.ToLower(reg.ReplaceAllString(s, ""))
 }
+
+func (s *LinkQuService) CheckPaymentStatus(partnerReff string) (*entity.LinkQuCheckStatusResponse, error) {
+	path := "/transaction/payment/checkstatus"
+	method := "GET"
+
+	url := fmt.Sprintf("%s%s%s?username=%s&partnerreff=%s",
+		s.config.LinkQuBaseURL(), "/linkqu-partner", path, s.config.LinkQuUsername(), partnerReff)
+
+	httpReq, err := http.NewRequest(method, url, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create HTTP request: %w", err)
+	}
+
+	httpReq.Header.Set("Content-Type", "application/json")
+	httpReq.Header.Set("client-id", s.config.LinkQuClientID())
+	httpReq.Header.Set("client-secret", s.config.LinkQuClientSecret())
+
+	resp, err := s.client.Do(httpReq)
+	if err != nil {
+		return nil, fmt.Errorf("failed to send request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response body: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("unexpected status code: %d, body: %s", resp.StatusCode, string(body))
+	}
+
+	// Parse response
+	var checkStatusResp entity.LinkQuCheckStatusResponse
+	if err := json.Unmarshal(body, &checkStatusResp); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal response: %w", err)
+	}
+
+	if checkStatusResp.ResponseCode != "00" {
+		return nil, fmt.Errorf("error when checking payment status, status code %s", checkStatusResp.ResponseCode)
+	}
+
+	return &checkStatusResp, nil
+}