Requests a checkout url and it’s expiration time from the connected shop. Depending on the shop, the expiration time can be very short or not present at all. It is possible that the returned expiration date is already in the past, which enforces the effect that is can not be cached.
Returns the checkout url.
A unified resource link.
An optional date-time-string in the format ISO 8601 (YYYY-MM-DDTH:i:s.fZ). The url does not expire if this field os not set. The returned timezone is always UTC (+00:00)