exchangeCode

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: exchangeCode

Indicates a relationship where one entity trades or swaps a code with another entity, typically to obtain access, authorization, or some corresponding value in return.