As of my last knowledge update in January 2022, I don’t have specific information about a “Customizer API” that is universally known or widely recognized in the technology industry. It’s possible that the term might refer to a specific API provided by a particular software, service, or platform.

If “Customizer API” is associated with a specific product, service, or company, I recommend checking the official documentation, developer resources, or support channels provided by that entity. This will give you the most accurate and up-to-date information about the API, its functionalities, and how to use it.

If “Customizer API” has become a term or product introduced after my last update, I suggest checking the latest online resources, official websites, or developer communities associated with the relevant technology or industry to gather the most recent information.

If you have more context or details about where you came across this term, I might be able to provide more targeted assistance.