setCookie function
void
setCookie()
Implementation
void setCookie() {
final expires = DateTime.now().add(Duration(days: 60));
final expiresStr = expires.toUtc().toIso8601String();
_cookie =
'cashierCookie=d9019e95-e104-4920-9259-28c2075bb918; expires=$expiresStr; path=/';
}