Does Subscriber work with SendGrid mailing service?

As is, the plugin does not work with SendGrid. But the plugin can be extended to add any number of services to it. Currently the only two that are supported in the plugin are MailChimp and ActiveCampaign.

If you are coding a solution, you can follow the example of how either MailChimp or ActiveCampaign extends the default SDWOO_Create_Discount class.