If you are asking if you can have the source code of the firmware, you have to ask the developer for that. If no readback protection has been set when flashing the chip, it is possible to read the firmware hex file from flash using nrfjprog or nRFGo studio, if you connect the device to your computer using a Segger debugger. This will not give you the source code of the firmware.
We provide example applications for a general BLE Beacon (which can be used as a starting point for an iBeacon) and Eddystone Beacon in our SDK.
