TABLE: wp_lifterlms_product_to_voucher
- product_id
- voucher_id

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TABLE: wp_lifterlms_voucher_code_redemptions
- id
- code_id
- user_id
- redemption_date

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TABLE: wp_lifterlms_vouchers_codes
- id
- voucher_id
- code
- redemption_count
- is_deleted
- created_at
- updated_at

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