Directive 2014/67/EU on the enforcement of Directive 96/71/EC and Directive (EU) 2018/957 amending Directive 96/71/EC oblige EU Member States to publish on a single website the rules on remuneration (and other mandatory terms of employment) for workers posted to that country. Member States have only partially fulfilled this obligation, publishing on their single websites selective, unstructured and primarily only indicative information in English. Most of the information was placed in the official language of the given country.

Here is the link to the uniform website provided by the official portal of the European Commission:
https://vinnumalastofnun.is/en/work-permits/foreign-service-companies-and-temporary-work-agencies/posted-workers

We recommend that companies delegating employees take advantage of precise and verified knowledge on the working conditions and remuneration applicable at a given time, in a given region and industry in which the Polish company delegating employees will operate. Such information is provided free of charge by the Brighton&Wood Law Firm: