Provider is a related term of provisory.
As a noun provider
is one who, or that which, provides a service, commodity, or the means for subsistence.
As an adjective provisory is
containing (a) proviso(es).
One who, or that which, provides a service, commodity, or the means for subsistence.
* Internet service provider
* health care service provider
containing (a) proviso(es)
:''The provisory clause effectively excluded his otherwise logical heirs from his main inheritance
dependent on a condition (proviso)
:''A provisory guarantee is rather like blackmail
pending something more permanent
* (relating to a proviso) conditional
* (pending something) provisional, temporary, transitory