Final answer:
A goalkeeper switch in soccer can occur during any stoppage in play with the referee's permission, not just at halftime, after a goal, or when the current goalkeeper is injured.
Step-by-step explanation:
A team can make a goalkeeper switch during a stoppage in play with the referee's permission. This doesn't need to be during halftime or after a goal has been scored. The switch is also not restricted only to instances when the current goalkeeper is injured. Instead, the team can change the goalkeeper at any stoppage, such as when a player is injured, during a substitution, or while a goal kick is being set up, so long as they have the referee's consent to do so.