Creates a tier.
The name for a tier and the amount of required points to qualify for a tier can only exist for a single tier.
Attempts to create a tier with a tierDefinition.name or requiredPoints that already exists will return an error.
To create up to 20 tiers at once, use bulkCreateTiers().
Note: You must have a Business VIP Premium plan or a Scale Premium plan to add tiers.
This function requires elevated permissions and runs only on the backend and on dashboard pages.
Tier to create.
This method doesn’t return any custom errors, but may return standard errors. Learn more about standard Wix errors.