Verifying that the webhook request data came from Wix

Question

I am creating an app for the Wix platform using the Laravel framework.

I have registered webhooks but now I have to verify that webhook request using PHP. The encryption technique I have to use is the RS256 algorithm but I can't find any RS256 algorithm-related function in PHP.

I have also searched for GitHub packages but had no luck.

can anyone tell me how can I verify that webhook request using the RS256 algorithm?