Google Search API will be shut down on Jan 1st 2027. It's already closed for new clients, only existing users can run until the end of the year.

https://developers.google.com/custom-search/v1/overview

> Note: The Custom Search JSON API is closed to new customers. Vertex AI Search is a favorable alternative for searching up to 50 domains. Alternatively, if your use case necessitates full web search, contact us to express your interest in and get more information about our full web search solution. Existing Custom Search JSON API customers have until January 1, 2027 to transition to an alternative solution.