Which customer loyalty innovation was first widely adopted by religious bookstores in the 2010s, dramatically increasing repeat customer visits?

Religious bookstores and spiritual resource centers have evolved their customer engagement strategies over the decades. As specialized retailers catering to specific faith communities, they've pioneered unique approaches to customer loyalty that blend commercial interests with spiritual values. This trivia question explores an innovative loyalty program approach that revolutionized how religious bookstores maintain customer relationships while honoring their spiritual missions.

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Faith community discounts (offering sliding-scale pricing based on financial need)
Spiritual growth journey tracking (where purchases unlock access to deeper study resources)
Prayer request submission system (allowing customers to submit prayer needs with purchases)
Scriptural spending rewards (where purchase totals correlate to donated religious texts)