How to combine these two?

Hey all-I am trying to make a project which involves a pulse sensor sending output when the BPM is over 90 to an API bot through whatsapp. I have each of these up and working, but I have no idea where to start to how to combine these. I don't know how to have the output act as a variable of some sort to replace the message. Help is needed.

For the Whatsapp code:

#include <WiFi.h>
#include <HTTPClient.h>

const char WIFI_SSID[] = "XXX";         // CHANGE IT         // CHANGE IT
const char WIFI_PASSWORD[] = "XXX"; // CHANGE IT

String HOST_NAME   = "https://api.callmebot.com"; // CHANGE IT

String PATH_NAME   = "/whatsapp.php?phone=PHONENUMBER&text=TEXT&apikey=APIKEY";      // CHANGE IT

void setup() {
  Serial.begin(9600); 

  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.println("Connecting");
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
  
  HTTPClient http;

  http.begin(HOST_NAME + PATH_NAME); //HTTP
  int httpCode = http.GET();

  // httpCode will be negative on error
  if(httpCode > 0) {
    // file found at server
    if(httpCode == HTTP_CODE_OK) {
      String payload = http.getString();
      Serial.println(payload);
    } else {
      // HTTP header has been send and Server response header has been handled
      Serial.printf("[HTTP] GET... code: %d\n", httpCode);
    }
  } else {
    Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
  }

  http.end();
}

void loop() {

}

For the Pulse Sensor Code:

#include <PulseSensorPlayground.h>


const int OUTPUT_TYPE = PROCESSING_VISUALIZER;


const int PULSE_INPUT = 36;
const int PULSE_BLINK = 13;
const int PULSE_FADE = 5;
const int THRESHOLD = 550;   

PulseSensorPlayground pulseSensor;

void setup() {
  
  Serial.begin(115200);


  pulseSensor.analogInput(PULSE_INPUT);
  pulseSensor.blinkOnPulse(PULSE_BLINK);
  pulseSensor.fadeOnPulse(PULSE_FADE);

  pulseSensor.setSerial(Serial);
  pulseSensor.setOutputType(OUTPUT_TYPE);
  pulseSensor.setThreshold(THRESHOLD);

  if (!pulseSensor.begin()) {
   
    for(;;) {
      digitalWrite(PULSE_BLINK, LOW);
      delay(50); Serial.println('!');
      digitalWrite(PULSE_BLINK, HIGH);
      delay(50);
    }
  }
}

void loop() {
   
if(pulseSensor.UsingHardwareTimer){
 
  delay(20); 
  pulseSensor.outputSample();
} else {

  if (pulseSensor.sawNewSample()) {
   
    if (--pulseSensor.samplesUntilReport == (byte) 0) {
      pulseSensor.samplesUntilReport = SAMPLES_PER_SERIAL_SAMPLE;
      pulseSensor.outputSample();
    }
  }
}

    if (pulseSensor.sawStartOfBeat()) {
      pulseSensor.outputBeat();
    }
}

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