ERPNext Customization for Attendance module

Hi, We need to develop a small ERPNext module, Can you please confirm if you can do and the pricing. The requirement is: We need to create a module which will expose an URL like cams-attendance/new-entry and handle the following parameters . stgid->service tag id, means machine id, userid->alpha-numerical user id (max: 9 digit) att_time->timestamp of attendance date & time att_type-> in/out auth_token-> A 64(max) digit alphanumeric key The URL will accept the attendance through URL. The received attendance data should be stored as part of the standard attendance module