post https://acuityscheduling.com/api/v1/certificates
Create a package or coupon certificate.
Create certificate codes for packages, coupons, etc. in Acuity. Either productID (for packages) or couponID must be submitted. If you have one picked out (eg. "FOOBAR") you can submit the certificate parameter as well, otherwise we'll generate a random certificate for you.
Submitting the email parameter for a package assigns the certificate to that client email address.