Hi there Oscar,
Welcome to planDisney and thank you so much for stopping by with your question!
It sounds like you're trying to find your
Magic Key pass payment date. From my experience, the best place to find this information is on the contract you received when you first purchased your pass. If you purchased it online then it would have been emailed to you, but if you purchased it in person then you likely would have been handed a physical copy instead.
If you're still having trouble tracking this information down then I would recommend
calling the Magic Key Payment Plan Guest Services number at 1-800-410-4656. They will be able to locate the specific details of your payment plan to share with you and the remaining balance for your pass.
Magic Keys are such a great way to experience the magic of the Disneyland Resort all year round, so I'm glad to hear you're taking advantage of one, Oscar. Thanks again for your question and I hope you have a wonderful time at the Happiest Place on Earth.
Have a Magical Day,
Greg