In DIGI Xbee 3 module i want to send zigbee data through UART to my MCU

In DIGI Xbee 3 module I want to send ZigBee data through UART to my MCU any suggestions for it? Do we need CTS RTS pins too for communication if required then how to access them? any library for UART communication??
Im able to loop back using stdin and stdout buffer. example given in reference.

No you do not need /CTS and RTS but you do need VCC, GND and at least DI or Dout.

The XBee can be used as a serial cable as such, Digi does not offer a library file. That is to say, you only need to write your code for your processor to use the Data in and data out lines just like it would be if there was a wire connected.