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Quoting from a comment of @BrockAdams to one of my answers, the preview parameter is used for development and testing purposes.

If you set it to true, your request will only simulate whether it is a valid request or not and will not change anything on the site.

Quoting from a comment of @BrockAdams to one of my answers, the preview parameter is used for development and testing purposes.

If you set it to true, your request will only simulate whether it is a valid request or not and will not change anything on the site.

Quoting from a comment of @BrockAdams to one of my answers, preview parameter is used for development and testing purposes. If you set it to true, your request will only simulate whether it is a valid request or not and will not change anything on the site.

Quoting from a comment of @BrockAdams to one of my answers, the preview parameter is used for development and testing purposes. 

If you set it to true, your request will only simulate whether it is a valid request or not and will not change anything on the site.

Quoting from a comment of @BrockAdams to one of my answers, preview parameter is used for development and testing purposes. If you set it to true, your request will only simulate whether it is a valid request or not and will not change anything on the site.

Quoting from a comment of @BrockAdams to one of my answers, preview parameter is used for development and testing purposes. If you set it to true, your request will only simulate whether it is a valid request or not and will not change anything on the site.