Multi-tier membership architecture with configurable qualification criteria per tier: spend thresholds, transaction count, product category mix, or composite scoring that weights multiple signals rather than a single metric. Tier calculation runs on qualification windows your business defines, calendar year, rolling 12 months, or program year, with the window choice determining how quickly customers can qualify and how sticky their status is. Tier-specific benefit configuration covering every lever a loyalty program can offer: earn rate multipliers (Gold earns 2x, Platinum earns 3x), exclusive product or service access, priority customer service queue routing, free shipping thresholds, birthday bonuses, and partner benefits from co-branded reward partners. Downgrade policies with grace periods: a member who drops below Gold qualification at year-end retains Gold status for a configurable grace period (typically 60-90 days) with targeted communications designed to drive the incremental spend that maintains status, the retention mechanic that converts at-risk members before they leave. Upgrade journey communications: automated messages triggered at configurable spend thresholds below the next tier (e.g., "Spend £120 more this month to reach Gold") personalised to the member's current velocity and the remaining window, the communication pattern shown to increase qualification rates by 15-25% in programs we have shipped. B2B tier structures for distributor and channel partner programs: qualification based on order volume, product range breadth, and certified staff counts rather than consumer purchase patterns; tier benefits including rebate rates, co-marketing support, and dedicated account management access.