diff --git a/components/helpers.js b/components/helpers.js
index 1da5443..d611686 100644
--- a/components/helpers.js
+++ b/components/helpers.js
@@ -54,3 +54,15 @@ exports.eresultError = function(eresult) {
 	err.eresult = eresult;
 	return err;
 };
+
+exports.decodeJwt = function(jwt) {
+	let parts = jwt.split('.');
+	if (parts.length != 3) {
+		throw new Error('Invalid JWT');
+	}
+
+	let standardBase64 = parts[1].replace(/-/g, '+')
+		.replace(/_/g, '/');
+
+	return JSON.parse(Buffer.from(standardBase64, 'base64').toString('utf8'));
+}
diff --git a/components/twofactor.js b/components/twofactor.js
index 651c691..eb5d105 100644
--- a/components/twofactor.js
+++ b/components/twofactor.js
@@ -2,158 +2,151 @@ var SteamTotp = require('steam-totp');
 var SteamCommunity = require('../index.js');
 
 var ETwoFactorTokenType = {
-	"None": 0,                  // No token-based two-factor authentication
-	"ValveMobileApp": 1,        // Tokens generated using Valve's special charset (5 digits, alphanumeric)
-	"ThirdParty": 2             // Tokens generated using literally everyone else's standard charset (6 digits, numeric). This is disabled.
+	None: 0,                  // No token-based two-factor authentication
+	ValveMobileApp: 1,        // Tokens generated using Valve's special charset (5 digits, alphanumeric)
+	ThirdParty: 2             // Tokens generated using literally everyone else's standard charset (6 digits, numeric). This is disabled.
 };
 
 SteamCommunity.prototype.enableTwoFactor = function(callback) {
-	var self = this;
+	this._verifyMobileAccessToken();
 
-	this.getWebApiOauthToken(function(err, token) {
-		if(err) {
+	if (!this.mobileAccessToken) {
+		callback(new Error('No mobile access token available. Provide one by calling setMobileAppAccessToken()'));
+		return;
+	}
+
+	this.httpRequestPost({
+		uri: "https://api.steampowered.com/ITwoFactorService/AddAuthenticator/v1/?access_token=" + this.mobileAccessToken,
+		// TODO: Send this as protobuf to more closely mimic official app behavior
+		form: {
+			steamid: this.steamID.getSteamID64(),
+			authenticator_time: Math.floor(Date.now() / 1000),
+			authenticator_type: ETwoFactorTokenType.ValveMobileApp,
+			device_identifier: SteamTotp.getDeviceID(this.steamID),
+			sms_phone_id: '1'
+		},
+		json: true
+	}, (err, response, body) => {
+		if (err) {
 			callback(err);
 			return;
 		}
 
-		self.httpRequestPost({
-			"uri": "https://api.steampowered.com/ITwoFactorService/AddAuthenticator/v1/",
-			"form": {
-				"steamid": self.steamID.getSteamID64(),
-				"access_token": token,
-				"authenticator_time": Math.floor(Date.now() / 1000),
-				"authenticator_type": ETwoFactorTokenType.ValveMobileApp,
-				"device_identifier": SteamTotp.getDeviceID(self.steamID),
-				"sms_phone_id": "1"
-			},
-			"json": true
-		}, function(err, response, body) {
-			if (err) {
-				callback(err);
-				return;
-			}
+		if (!body.response) {
+			callback(new Error('Malformed response'));
+			return;
+		}
 
-			if(!body.response) {
-				callback(new Error("Malformed response"));
-				return;
-			}
+		if (body.response.status != 1) {
+			var error = new Error('Error ' + body.response.status);
+			error.eresult = body.response.status;
+			callback(error);
+			return;
+		}
 
-			if(body.response.status != 1) {
-				var error = new Error("Error " + body.response.status);
-				error.eresult = body.response.status;
-				callback(error);
-				return;
-			}
-
-			callback(null, body.response);
-		}, "steamcommunity");
-	});
+		callback(null, body.response);
+	}, 'steamcommunity');
 };
 
 SteamCommunity.prototype.finalizeTwoFactor = function(secret, activationCode, callback) {
-	var attemptsLeft = 30;
-	var diff = 0;
+	this._verifyMobileAccessToken();
 
-	var self = this;
-	this.getWebApiOauthToken(function(err, token) {
-		if(err) {
-			callback(err);
-			return;
-		}
+	if (!this.mobileAccessToken) {
+		callback(new Error('No mobile access token available. Provide one by calling setMobileAppAccessToken()'));
+		return;
+	}
 
-		SteamTotp.getTimeOffset(function(err, offset, latency) {
-			if (err) {
-				callback(err);
-				return;
-			}
+	let attemptsLeft = 30;
+	let diff = 0;
 
-			diff = offset;
-			finalize(token);
-		});
-	});
+	let finalize = () => {
+		let code = SteamTotp.generateAuthCode(secret, diff);
 
-	function finalize(token) {
-		var code = SteamTotp.generateAuthCode(secret, diff);
-
-		self.httpRequestPost({
-			"uri": "https://api.steampowered.com/ITwoFactorService/FinalizeAddAuthenticator/v1/",
-			"form": {
-				"steamid": self.steamID.getSteamID64(),
-				"access_token": token,
-				"authenticator_code": code,
-				"authenticator_time": Math.floor(Date.now() / 1000),
-				"activation_code": activationCode
+		this.httpRequestPost({
+			uri: 'https://api.steampowered.com/ITwoFactorService/FinalizeAddAuthenticator/v1/?access_token=' + this.mobileAccessToken,
+			form: {
+				steamid: this.steamID.getSteamID64(),
+				authenticator_code: code,
+				authenticator_time: Math.floor(Date.now() / 1000),
+				activation_code: activationCode
 			},
-			"json": true
+			json: true
 		}, function(err, response, body) {
 			if (err) {
 				callback(err);
 				return;
 			}
 
-			if(!body.response) {
-				callback(new Error("Malformed response"));
+			if (!body.response) {
+				callback(new Error('Malformed response'));
 				return;
 			}
 
 			body = body.response;
 
-			if(body.server_time) {
+			if (body.server_time) {
 				diff = body.server_time - Math.floor(Date.now() / 1000);
 			}
 
-			if(body.status == 89) {
-				callback(new Error("Invalid activation code"));
+			if (body.status == 89) {
+				callback(new Error('Invalid activation code'));
 			} else if(body.want_more) {
 				attemptsLeft--;
 				diff += 30;
 
-				finalize(token);
+				finalize();
 			} else if(!body.success) {
-				callback(new Error("Error " + body.status));
+				callback(new Error('Error ' + body.status));
 			} else {
 				callback(null);
 			}
-		}, "steamcommunity");
+		}, 'steamcommunity');
 	}
-};
 
-SteamCommunity.prototype.disableTwoFactor = function(revocationCode, callback) {
-	var self = this;
-
-	this.getWebApiOauthToken(function(err, token) {
-		if(err) {
+	SteamTotp.getTimeOffset(function(err, offset, latency) {
+		if (err) {
 			callback(err);
 			return;
 		}
 
-		self.httpRequestPost({
-			"uri": "https://api.steampowered.com/ITwoFactorService/RemoveAuthenticator/v1/",
-			"form": {
-				"steamid": self.steamID.getSteamID64(),
-				"access_token": token,
-				"revocation_code": revocationCode,
-				"steamguard_scheme": 1
-			},
-			"json": true
-		}, function(err, response, body) {
-			if (err) {
-				callback(err);
-				return;
-			}
-
-			if(!body.response) {
-				callback(new Error("Malformed response"));
-				return;
-			}
-
-			if(!body.response.success) {
-				callback(new Error("Request failed"));
-				return;
-			}
-
-			// success = true means it worked
-			callback(null);
-		}, "steamcommunity");
+		diff = offset;
+		finalize();
 	});
 };
+
+SteamCommunity.prototype.disableTwoFactor = function(revocationCode, callback) {
+	this._verifyMobileAccessToken();
+
+	if (!this.mobileAccessToken) {
+		callback(new Error('No mobile access token available. Provide one by calling setMobileAppAccessToken()'));
+		return;
+	}
+
+	this.httpRequestPost({
+		uri: 'https://api.steampowered.com/ITwoFactorService/RemoveAuthenticator/v1/?access_token=' + this.mobileAccessToken,
+		form: {
+			steamid: this.steamID.getSteamID64(),
+			revocation_code: revocationCode,
+			steamguard_scheme: 1
+		},
+		json: true
+	}, function(err, response, body) {
+		if (err) {
+			callback(err);
+			return;
+		}
+
+		if (!body.response) {
+			callback(new Error('Malformed response'));
+			return;
+		}
+
+		if (!body.response.success) {
+			callback(new Error('Request failed'));
+			return;
+		}
+
+		// success = true means it worked
+		callback(null);
+	}, 'steamcommunity');
+};
diff --git a/components/webapi.js b/components/webapi.js
index b1ea5c4..a138ee5 100644
--- a/components/webapi.js
+++ b/components/webapi.js
@@ -1,5 +1,7 @@
 var SteamCommunity = require('../index.js');
 
+const Helpers = require('./helpers.js');
+
 SteamCommunity.prototype.getWebApiKey = function(domain, callback) {
 	var self = this;
 	this.httpRequest({
@@ -45,7 +47,7 @@ SteamCommunity.prototype.getWebApiKey = function(domain, callback) {
 };
 
 /**
- * @deprecated No longer works if not logged in via mobile login. Will be removed in a future release.
+ * @deprecated No longer works. Will be removed in a future release.
  * @param {function} callback
  */
 SteamCommunity.prototype.getWebApiOauthToken = function(callback) {
@@ -53,5 +55,64 @@ SteamCommunity.prototype.getWebApiOauthToken = function(callback) {
 		return callback(null, this.oAuthToken);
 	}
 
-	callback(new Error('This operation requires an OAuth token, which can only be obtained from node-steamcommunity\'s `login` method.'));
+	callback(new Error('This operation requires an OAuth token, which is no longer issued by Steam.'));
+};
+
+/**
+ * Sets an access_token generated by steam-session using EAuthTokenPlatformType.MobileApp.
+ * Required for some operations such as 2FA enabling and disabling.
+ * This will throw an Error if the provided token is not valid, was not generated for the MobileApp platform, is expired,
+ * or does not belong to the logged-in user account.
+ *
+ * @param {string} token
+ */
+SteamCommunity.prototype.setMobileAppAccessToken = function(token) {
+	if (!this.steamID) {
+		throw new Error('Log on to steamcommunity before setting a mobile app access token');
+	}
+
+	let decodedToken = Helpers.decodeJwt(token);
+
+	if (!decodedToken.iss || !decodedToken.sub || !decodedToken.aud || !decodedToken.exp) {
+		throw new Error('Provided value is not a valid Steam access token');
+	}
+
+	if (decodedToken.iss == 'steam') {
+		throw new Error('Provided token is a refresh token, not an access token');
+	}
+
+	if (decodedToken.sub != this.steamID.getSteamID64()) {
+		throw new Error(`Provided token belongs to account ${decodedToken.sub}, but we are logged into ${this.steamID.getSteamID64()}`);
+	}
+
+	if (decodedToken.exp < Math.floor(Date.now() / 1000)) {
+		throw new Error('Provided token is expired');
+	}
+
+	if ((decodedToken.aud || []).indexOf('mobile') == -1) {
+		throw new Error('Provided token is not valid for MobileApp platform type');
+	}
+
+	this.mobileAccessToken = token;
+};
+
+/**
+ * Verifies that the mobile access token we already have set is still valid for current login.
+ *
+ * @private
+ */
+SteamCommunity.prototype._verifyMobileAccessToken = function() {
+	if (!this.mobileAccessToken) {
+		// No access token, so nothing to do here.
+		return;
+	}
+
+	let decodedToken = Helpers.decodeJwt(this.mobileAccessToken);
+
+	let isTokenInvalid = decodedToken.sub != this.steamID.getSteamID64()    // SteamID doesn't match
+		|| decodedToken.exp < Math.floor(Date.now() / 1000);                      // Token is expired
+
+	if (isTokenInvalid) {
+		delete this.mobileAccessToken;
+	}
 };
diff --git a/examples/disable_twofactor.js b/examples/disable_twofactor.js
index 1c2c617..389ca93 100644
--- a/examples/disable_twofactor.js
+++ b/examples/disable_twofactor.js
@@ -48,15 +48,34 @@ function doLogin(accountName, password, authCode, captcha, rCode) {
 		}
 
 		console.log('Logged on!');
-		community.disableTwoFactor('R' + rCode, (err) => {
-			if (err) {
-				console.log(err);
-				process.exit();
-				return;
-			}
 
-			console.log('Two-factor authentication disabled!');
-			process.exit();
+		if (community.mobileAccessToken) {
+			// If we already have a mobile access token, we don't need to prompt for one.
+			doRevoke(rCode);
+			return;
+		}
+
+		console.log('You need to provide a mobile app access token to continue.');
+		console.log('You can generate one using steam-session (https://www.npmjs.com/package/steam-session).');
+		console.log('The access token needs to be generated using EAuthTokenPlatformType.MobileApp.');
+		console.log('Make sure you provide an *ACCESS* token, not a refresh token.');
+
+		rl.question('Access Token: ', (accessToken) => {
+			community.setMobileAppAccessToken(accessToken);
+			doRevoke(rCode);
 		});
 	});
 }
+
+function doRevoke(rCode) {
+	community.disableTwoFactor('R' + rCode, (err) => {
+		if (err) {
+			console.log(err);
+			process.exit();
+			return;
+		}
+
+		console.log('Two-factor authentication disabled!');
+		process.exit();
+	});
+}
diff --git a/examples/enable_twofactor.js b/examples/enable_twofactor.js
index 60495a8..9f95942 100644
--- a/examples/enable_twofactor.js
+++ b/examples/enable_twofactor.js
@@ -56,41 +56,60 @@ function doLogin(accountName, password, authCode, captcha) {
 		}
 
 		console.log('Logged on!');
-		community.enableTwoFactor((err, response) => {
-			if (err) {
-				if (err.eresult == EResult.Fail) {
-					console.log('Error: Failed to enable two-factor authentication. Do you have a phone number attached to your account?');
-					process.exit();
-					return;
-				}
 
-				if (err.eresult == EResult.RateLimitExceeded) {
-					console.log('Error: RateLimitExceeded. Try again later.');
-					process.exit();
-					return;
-				}
+		if (community.mobileAccessToken) {
+			// If we already have a mobile access token, we don't need to prompt for one.
+			doSetup();
+			return;
+		}
 
-				console.log(err);
-				process.exit();
-				return;
-			}
+		console.log('You need to provide a mobile app access token to continue.');
+		console.log('You can generate one using steam-session (https://www.npmjs.com/package/steam-session).');
+		console.log('The access token needs to be generated using EAuthTokenPlatformType.MobileApp.');
+		console.log('Make sure you provide an *ACCESS* token, not a refresh token.');
 
-			if (response.status != EResult.OK) {
-				console.log(`Error: Status ${response.status}`);
-				process.exit();
-				return;
-			}
-
-			let filename = `twofactor_${community.steamID.getSteamID64()}.json`;
-			console.log(`Writing secrets to ${filename}`);
-			console.log(`Revocation code: ${response.revocation_code}`);
-			FS.writeFileSync(filename, JSON.stringify(response, null, '\t'));
-
-			promptActivationCode(response);
+		rl.question('Access Token: ', (accessToken) => {
+			community.setMobileAppAccessToken(accessToken);
+			doSetup();
 		});
 	});
 }
 
+function doSetup() {
+	community.enableTwoFactor((err, response) => {
+		if (err) {
+			if (err.eresult == EResult.Fail) {
+				console.log('Error: Failed to enable two-factor authentication. Do you have a phone number attached to your account?');
+				process.exit();
+				return;
+			}
+
+			if (err.eresult == EResult.RateLimitExceeded) {
+				console.log('Error: RateLimitExceeded. Try again later.');
+				process.exit();
+				return;
+			}
+
+			console.log(err);
+			process.exit();
+			return;
+		}
+
+		if (response.status != EResult.OK) {
+			console.log(`Error: Status ${response.status}`);
+			process.exit();
+			return;
+		}
+
+		let filename = `twofactor_${community.steamID.getSteamID64()}.json`;
+		console.log(`Writing secrets to ${filename}`);
+		console.log(`Revocation code: ${response.revocation_code}`);
+		FS.writeFileSync(filename, JSON.stringify(response, null, '\t'));
+
+		promptActivationCode(response);
+	});
+}
+
 function promptActivationCode(response) {
 	rl.question('SMS Code: ', (smsCode) => {
 		community.finalizeTwoFactor(response.shared_secret, smsCode, (err) => {
diff --git a/index.js b/index.js
index 17c73b7..dc38428 100644
--- a/index.js
+++ b/index.js
@@ -214,6 +214,12 @@ SteamCommunity.prototype.login = function(details, callback) {
 	}
 };
 
+/**
+ * @deprecated
+ * @param {string} steamguard
+ * @param {string} token
+ * @param {function} callback
+ */
 SteamCommunity.prototype.oAuthLogin = function(steamguard, token, callback) {
 	steamguard = steamguard.split('||');
 	var steamID = new SteamID(steamguard[0]);
@@ -300,6 +306,10 @@ SteamCommunity.prototype.setCookies = function(cookies) {
 
 		this._setCookie(Request.cookie(cookie), !!(cookieName.match(/^steamMachineAuth/) || cookieName.match(/Secure$/)));
 	});
+
+	// The account we're logged in as might have changed, so verify that our mobile access token (if any) is still valid
+	// for this account.
+	this._verifyMobileAccessToken();
 };
 
 SteamCommunity.prototype.getSessionID = function(host = "http://steamcommunity.com") {