Google Geolocation API: Help setting up JSON PUSH with Webhooks

Troubleshooting
4

Here’s the code I made for the EXACT same purpose. Mind you it only allows 4 Wi-Fi networks to be sent, so it isn’t perfect, but it is still accurate to ~10m, depending on where you are.

#define SCANNED 4

WiFiAccessPoint aps[SCANNED];
String msg;
String mac;
unsigned long t = 0;

void setup() {
    Particle.subscribe("hook-response/geolocation", getLoc, MY_DEVICES);
    Serial.begin(9600);
    while (!Serial.available()) Particle.process();
}

void loop() {
    if (millis()-t > 3500) {
        msg = "{ ";
        WiFi.scan(aps, SCANNED);
        Particle.process();
        for (int x = 0; x < SCANNED; x++) {
            mac = "";
            for (int y= 0; y < 6; y++) {
                mac = mac+String(aps[x].bssid[y], HEX);
                if (y != 5) {
                    mac = mac+":";
                }
            }
            mac.toUpperCase();
            msg = msg+"\"mac"+String(x)+"\": \""+mac+"\", \"sig"+String(x)+"\": \""+String(aps[x].rssi)+"\", \"channel"+String(x)+"\": \""+String(aps[x].channel)+"\"";
            if (x != 3) {
                msg = msg+", ";
            }
            Particle.process();
        }
        msg = msg+" }";
        Serial.println(msg);
        Particle.publish("geolocation", msg, 60, PRIVATE);
        t = millis();
    }
}

void getLoc(const char *name, const char *data) {
    Serial.println(data);
}

And the webhook:

{
    "eventName": "geolocation",
    "url": "https://www.googleapis.com/geolocation/v1/geolocate?key=YOUR_KEY",
    "requestType": "POST",
	"json": {
		"wifiAccessPoints": [
		{
			"macAddress": "{{mac0}}",
			"signalStrength": "{{sig0}}",
			"channel": "{{channel0}}"
		},
		{
			"macAddress": "{{mac1}}",
			"signalStrength": "{{sig1}}",
			"channel": "{{channel1}}"
		},
		{
			"macAddress": "{{mac2}}",
			"signalStrength": "{{sig2}}",
			"channel": "{{channel2}}"
		},
		{
			"macAddress": "{{mac3}}",
			"signalStrength": "{{sig3}}",
			"channel": "{{channel3}}"
		}
		]
	},
	"responseTemplate": "{{location.lat}}~{{location.lng}}~{{accuracy}}",
    "mydevices": true
}
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