What is the difference between 'Purchased' and 'Promotional' BPM Create credits?

Your ‘purchased credits’ are credits that you’ve personally paid for via a monthly Standard Membership, a monthly Premium membership, or a monthly Premium Plus Membership. Purchased credits can be used towards any sounds you’d like on the BPM Create platform, including sounds by music label partners.

‘Promotional credits’ are credits that have been gifted to you through an approved promotional campaign by BPM Create. These credits may only be used towards sounds and sound packs created by BPM Create.