The following tools are available for Google Pay API for Passes
Google Pay API for Passes client libraries
The Google Pay API for Passes is built on HTTP and JSON, so any standard HTTP client can send requests to it
and parse the responses.
However, the Google APIs client libraries provide better language integration, improved security,
and support for making calls that require user authorization. The client libraries are available in
a number of programming languages; by using them you can avoid the need to manually set up HTTP
requests and parse the responses.