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Are there any special requirements for Registrars to be able to offer fTLD Premium Names?

Yes, Registrars will need to ensure they have configured their systems to submit the create / renew / transfer commands in the appropriate format, which includes a price acknowledgment on period-based-fee-incurring transactions. This acknowledgment is mandatory, and failure to do so, results in the domain create / renew / transfer operation being unsuccessful. This is done through an extension in the EPP.  An example command follows: