Consider base path when generating third-party services API endpoint

internal/url/url.go

@@ -79,3 +79,26 @@ func Domain(websiteURL string) string {
 
 	return parsedURL.Host
 }
+
+// JoinBaseURLAndPath returns a URL string with the provided path elements joined together.
+func JoinBaseURLAndPath(baseURL, path string) (string, error) {
+	if baseURL == "" {
+		return "", fmt.Errorf("empty base URL")
+	}
+
+	if path == "" {
+		return "", fmt.Errorf("empty path")
+	}
+
+	_, err := url.Parse(baseURL)
+	if err != nil {
+		return "", fmt.Errorf("invalid base URL: %w", err)
+	}
+
+	finalURL, err := url.JoinPath(baseURL, path)
+	if err != nil {
+		return "", fmt.Errorf("unable to join base URL %s and path %s: %w", baseURL, path, err)
+	}
+
+	return finalURL, nil
+}