Meals paid in advance
The closest official rules for a pass of meals paid in advance are the SIC’s rules for prepaid vouchers (bonos de compra, certificados and tarjetas de regalo). A voucher proves that you paid in advance for a sum or for specific goods or services. It is not money and is not exchanged for cash.
It must be valid for at least one year from the day it is issued or activated. A longer term can be agreed, never a shorter one.
You can use it bit by bit until it runs out or the term ends. Using part of it does not extend the term unless that was agreed, and you must be told so when you buy.
If it is not used in time, what is left may be lost, as agreed when you bought it.
Source: Superintendencia de Industria y Comercio, Circular Única, Título II, numeral 2.18 (added by Circular Externa 6 de 2014) – official text

