Send a string from Blynk(Terminal) to Particle photon(Pins)

Hello Everyone,
My Hardware is “Particle photon”, i want, Type a String in Terminal widget on Blynk and get that string from particle’s pin (Like RX,TX in AVR Microcontroller).

my question:
1- Program?
2- which pin on particle photon?

Kind Regard.
YaserJulaee

Study virtual pins.