XBOX game pass ultimate. Cancel a euro test month?

Following question:

If I buy the XBOX game pass ultimate for one euro for a month, will the actual sales price be added there for another month, or can I just cancel after this one month? Because, as far as I could find now, there's actually only a minimal 3 months advance payment, right? Is this one euro test month separate from it?

If you end the trial month on time, there will be no additional costs, LG.