Dynamic Check-in Code Shortcuts for Door Access

Problem Statement: Hosts with gated properties that use time-based access codes (e.g., "2707" for July 2027) must manually update their check-in instructions every single month. This is repetitive, time-consuming, and prone to human error.

• Current Workaround: Manually editing check-in instructions each month to reflect the new year-and-month code.
• Impact: Monthly administrative overhead, risk of sending guests the wrong code if a month is missed, and a subpar guest experience if the code is outdated.
• Proposed Solution: Add a dynamic shortcut or placeholder in check-in instructions (e.g., {checkin_year_month}) that automatically pulls the guest's check-in date and inserts the correct code.
• Unlock: Hosts would be able to set their door code once and have check-in instructions update automatically based on the guest's arrival date — eliminating monthly manual edits entirely.