{
    promotion_id: 1,
    promotion_name: 'Test',
    active_from: '2025-02-06',
    active_until: '2025-02-28',
    uses_personal_coupons: false,
    times_used: 0,                       // read only
    coupon_code: 'PROMO10',              // optional, coupon-based promotions
    single_use_per_user: false,          // optional
    guest_single_use_handling: '...',    // optional
    validity_condition: { 
        condition_type: 'USER_LOGGED_IN' 
    },
    promotion_type: 'GENERAL_DISCOUNT',
    promotion_config: {
        discount_target: 'BASKET',
        is_exclusive: false,
        discount_calculation: 'PERCENT',
        discount_rate: 0.05,
        internal_discount_composition: 'HIGHEST_DISCOUNT',
        max_composite_discount: 0
        // GENERAL_DISCOUNT may also carry: discount_amount (fixed amount),
        // target_items_condition {...}, target_items_max, target_items_subset,
        // volume_group_by, volume_tiers: [ { min_quantity: ..., discounted_count: ... } ]
    },
    date_created: '2025-02-06T14:25:16Z',
    date_updated: '2025-02-06T14:26:23Z'
}