Support for Send API v3.1
Add support for Mailjet brand new Send API v3.1 currently in beta. Learn more at https://dev.mailjet.com/guides/?shell#send-api-v3-1-beta
Add support for Mailjet brand new Send API v3.1 currently in beta. Learn more at https://dev.mailjet.com/guides/?shell#send-api-v3-1-beta