Final answer:
API BaaS providers may have limits on the number of push notifications depending on the service plan, with some offering unlimited notifications and others imposing specific restrictions.
Step-by-step explanation:
When using an API Backend as a Service (BaaS), there may be any limit on the number of push notifications that can be sent out, which is often dependent on the specific service provider's plan and policies. Many BaaS providers offer different tiers of service, with each tier allowing a certain number of push notifications per month. Some may offer unlimited notifications, while others impose a limit. It's essential to review the terms of service of the particular BaaS provider to determine the exact limitations and whether additional costs may be incurred if these limits are exceeded.