Initiate an action with Button A or B

[rbrakus]

I would like to have it so a get request with arguments gets run when an action is made, for example pressing button A or B. I'm new with M5stickC and don't know how to do that.
This is the code for sending a SMS with a delay... but executing a API call with a button is unknown for me...

 #include <M5StickC.h>
 #include <Arduino.h>
 #include <WiFi.h>
 #include <WiFiMulti.h>
 #include <HTTPClient.h>
 #define USE_SERIAL Serial

WiFiMulti wifiMulti;

void setup() {

USE_SERIAL.begin(115200);

USE_SERIAL.println();
USE_SERIAL.println();
USE_SERIAL.println();

for(uint8_t t = 4; t > 0; t--) {
    USE_SERIAL.printf("[SETUP] WAIT %d...\n", t);
    USE_SERIAL.flush();
    delay(1000);
}

wifiMulti.addAP("xxxxx", "xxxxxx");

}

void loop() {
// wait for WiFi connection
if((wifiMulti.run() == WL_CONNECTED)) {

    HTTPClient http;

    USE_SERIAL.print("[HTTP] begin...\n");
    // configure traged server and url

      http.begin("https://api.46elks.com/a1/sms");
      http.addHeader("Content-Type", "application/x-www-form-urlencoded"); 
      http.setAuthorization("xxxxx", "xxxxxx");
      int httpCode = http.POST("from=+xxxxx&to=+xxxxxx&message=Hej");


    USE_SERIAL.print("[HTTP] GET...\n");
    // start connection and send HTTP header
     httpCode = http.GET();

    // httpCode will be negative on error
    if(httpCode > 0) {
        // HTTP header has been send and Server response header has been handled
        USE_SERIAL.printf("[HTTP] GET... code: %d\n", httpCode);

        // file found at server
        if(httpCode == HTTP_CODE_OK) {
            String payload = http.getString();
            USE_SERIAL.println(payload);
        }
    } else {
        USE_SERIAL.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
    }

    http.end();
}

delay(10000);
}

[m5stack]

@rbrakus

  if (M5.BtnA.wasPressed()) {
           ......
  }
  M5.update();

[rbrakus]

Thanks for the reply
Found the tutorial too!
http://forum.m5stack.com/topic/42/lesson-2-buttons-menu