RESTful Service to change properties of Alfresco file from Bonita BPM Community

Hello, Guys! I'm new to Bonita BPM and especially to Alfresco Community and I need your help. What I'm trying to do is to create a process in Bonita BPM 7.4.1 that can upload a file in Alfresco repository and change the properties to that file with values I set in Bonita. I have created a process in Bonita, that is using a CMIS connector to upload the file and it is working perfectly. I also created my custom model and custom aspects in Alfresco and they are containing my specific metadata for my file. What my problem is how to send the values of these custom properties to Alfresco. I guess I have to use a Restful service, that can set them up, but I can not find any examples and I'm a little bit confused. Is there anyone that have had these issues before? I will greatly appreciate your help and any examples.