Since there are always questions about licenses, we have tried to bring light into the darkness:
Whether you are allowed to use a purchased beat for your release depends on which rights of use §31 UrhG you have acquired.
The rights of use are recorded in licenses. A music license is an agreement between the author and the user of a composition. It regulates the permission to use the music in certain media and clarifies the specific conditions.
Exclusive or non-exclusive?
If you buy a beat exclusively, it is no longer available for sale to third parties.
If you choose a simple, non-exclusive beat instead (also called "leasing" / non-exclusive), it will still be available for sale to third parties afterwards.
In some stores, unfortunately, only exclusive content is allowed, i.e. releases and beats that you either composed yourself OR for which you have the exclusive, i.e. sole, rights.
This includes :
Even a temporary license, or a non-exclusive license is NOT sufficient.
Attention: even if you made your beat/production yourself, as soon as you use samples, nature sounds, loops or similar for this, this is no longer considered exclusive.
So be sure to check your license agreement to make sure you have the necessary rights to upload your release to the said stores.