1 ) The discount codes are applicable to all products in the store and not cumulative, you can only use one code at a time, unless it applies to a free shipping in which case the shipping discount plus the corresponding discount code used would be made.

1.1) The discount code "first" can be used only once per customer, has no expiration date and applies to the entire store with no minimum purchase value.

1.2) Promotional discounts from social networks have no expiration date or limitation of use (understanding as explained in point 1 that only one code can be used at a time).