You can easily find the ID of any of your plans via their record on the Admin Panel. Plan IDs are particularly useful for validation rules.

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Log in to dashboard.nexudus.com if you aren't already. 
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Click Inventory > Plans. 
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Click on the relevant plan. 
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Copy and save the number at the end of the page's URL, right after tariffs/. 
All done! Repeat the process for any other plan ID you need to find.