HELP FOR Xiamen airport STOPOVER

Hi! I will be flying from Manila (MNL) Airport to Beijing (PEK Airport) this 3rd week of April. However, there will be a stop in XM Gaoqui (XMN) Airpor before I flew to PEK. I havent contacted nor inquire with my airline. I just would like to know what this means as my Itinerary speaks merely of Beijing (PEK) as my airport. It merely mentrioned when I was searching my flight via the internet that there will be a stop at XMN. Please let me know what this means. This is the first time I availed of a china airline. Do I have to retrive my luggages upon arrival at XMN on my own? or the Airlines will do it? Do I have to pass through the procedures of an International or Domestic flights such as Customs and Immigration? Any help would be much appreciated. Thanks.