Create Subscriber Variablepost https://{APP_DOMAIN}/api/3.2/messages/variablesCreates a new subscriber variable (custom field) with a template merge tag.Body ParamsBody ParamsnamestringrequiredThe name of the variabletagstringrequiredThe template merge tag (e.g. '$first_name')data_typestringrequiredThe data type: 'text', 'number', or 'date'descriptionstringA description of the variabledefault_valuestringThe default value when not set on a subscriptionResponse 201The created VariableUpdated 22 days ago