Aligned the resource taxonomy: top-level Loyalty Cards, Rewards, and Vouchers endpoints return merchant templates; customer-scoped endpoints return customer loyalty cards, rewards, and vouchers.
Added customer loyalty-card, reward, and voucher list/detail endpoints, plus idempotent actions to give stamps, points, or rewards and adjust point balances.
Added the customers:write scope for customer loyalty mutations.
Added merchant-managed API keys with one-time secret display, one-way hashed storage, per-key scopes, optional expiry, rotation, revocation, and last-used auditing.
Added a dedicated API integration in the Merchant Portal while retaining legacy Zapier-key compatibility during migration.
Added order list and detail endpoints.
Added customer list, detail, and consolidated loyalty endpoints.
Added issued-reward list, detail, and redemption endpoints.
Added loyalty-card list and detail endpoints.
Added voucher lookup, issuance, cancellation, balance adjustment, and email-delivery endpoints.