Po prostu, dwa wyrazy wystarczają.

contract to perform services/contract of mandate

(by reference to Mrs Dorota Staniszewska, IPSKT UW)

What Is a Service Contract Agreement?

When a person or business hires a contractor to perform services, a service contract agreement defines the terms of the work to be performed, including the scope of the work and the related fees. A service contract may also be used to define the terms of an extended warranty on a product. There are many forms of service agreements, and the specific provisions included in the contract will vary based on the details of the actual services provided. - https://bizfluent.com/info-7959728-service-contract-agreemen...

umowa dotycząca zlecenia wykonania usług

agreement for the supply/provision of services
supply/privision of services agreement
services agreement

https://www.google.pl/search?ei=AfGWXvb_C8iHwPAPxa-VsAs&q="s...
https://www.google.pl/search?source=hp&ei=_vCWXobRCYm53APlk7...
https://www.google.pl/search?source=hp&ei=LPGWXqWlPJOWjgaog5...

AGREEMENT FOR THE SUPPLY OF SERVICES
https://www.naccc.org.uk/downloads/NACCC_agreement.pdf

SUPPLY OF SERVICE AGREEMENT
...
A supply of services agreement is a contract that sets out the terms by which services will be provided to a customer by a supplier.This note should be read in conjunction with the precedent supply of services agreement (hereinafter referred to as the “Services Agreement”).
https://www.unltd.org.uk/uploads/general_uploads/DLA-Piper-S...

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Note added at 1 hr (2020-04-15 11:39:39 GMT)
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provision miało być powyżej, sorry

Propozycja.