They 'require' it, but it is still possible to use the service without SSL. At least it was possible on stripe a few months ago. I'm not sure if they end up cut

They 'require' it, but it is still possible to use the service without SSL. At least it was possible on stripe a few months ago. I'm not sure if they end up cutting you off after they notice the non ssl traffic, but I setup some test apps that worked fine without ssl.