There is a cooperation between the client (=user of collana pay or also customer) and collana hive GmbH as contractor regarding services in the IT environment. Since it is possible or necessary for the performance of these services that the contractor obtains access to personal data, a contractual agreement on the processing of personal data on behalf of the client is required between the client as the controller and the contractor as the processor in accordance with Article 28 (3) of the GDPR.