Sorry, we are not familiar with the wordpress and PHP stack. Hence we cannot offer you a custom solution at this time.

But we can still provide you a generic guide which will help you to implement the solution in your own stack.

Our API is built using the REST standard.
Hence you can connect any language or framework or stack supporting REST.

You can use RapidAPIs auto-code generation feature to generate PHP code.
RapidAPIs auto-code generation doesn’t work correctly for all languages.
In this case you can optionally try using Postman application auto-code generation.

You can use Postman application for sending requests to our service.
Once you are able to setup postman correctly, then you use Postman auto-code
generation feature to generate PHP code.

Then you will have to find a way to integrate this into wordpress.