MailchimpSDK.initialize(token: d7f2671cd5d5b818f08f37aba1a25beb-us2) var contact: Contact = Contact(emailAddress: "Insert Email Here") MailchimpSDK.createOrUpdate(contact: contact) { result in switch result { case .success: print("Successfully added or updated contact") case .failure(let error): print("Error: \(error.localizedDescription)") } }