This parameter helps to control the amount of data returned to the client through pagination. In the case of EPCIS events, perPage specifies the maximum number of events in a response to the client. It does not mandate that the server reaches this limit. For example, if the server sees that some EPCIS events are very large, the server can decide to return fewer events to avoid creating an error because the response body is too large. As long as there are more resources to retrieve, the Link header contains the URL of the next page and the attribute rel=\"next\". The last page is indicated by the absence of the rel=\"next\". Depending on the implementation, there can be a global upper limit for the perPage value that the client cannot override, which should be stated in the documentation.