Actually, the license which you will get after purchasing the WP Travel Pro plugin will only work for a single domain. You cannot use the same license key for more than one site.
If you use the same license key in the new site which you have previously used on another site, it will generate an issue.
WP Travel Pro plugin can be used on multiple sites by purchasing for more than one subscription or by using WordPress Multisite.
For more detail regarding WP Travel Pro plugin for Multiple sites, please refer to our blog.
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