diff --git a/README b/README
index 47200eb..fe602ab 100644
--- a/README
+++ b/README
@@ -41,36 +41,6 @@ result, err := api.GetSearch("golang", v)
 
 (Remember that `url.Values` is equivalent to a `map[string][]string`, if you find that more convenient notation when specifying values). Otherwise, `nil` suffices.
 
-### Streaming
-
-Anaconda supports the Streaming APIs. You can use `PublicStream*` or `UserStream` API methods.
-A go loop is started an gives you an stream that sends `interface{}` objects through it's `chan` `C`
-Objects which you can cast into a tweet, event and more.
-
-
-````go
-v := url.Values{}
-s := api.UserStream(v)
-
-for t := range s.C {
-  switch v := t.(type) {
-  case anaconda.Tweet:
-    fmt.Printf("%-15s: %s\n", v.User.ScreenName, v.Text)
-  case anaconda.EventTweet:
-    switch v.Event.Event {
-    case "favorite":
-      sn := v.Source.ScreenName
-      tw := v.TargetObject.Text
-      fmt.Printf("Favorited by %-15s: %s\n", sn, tw)
-    case "unfavorite":
-      sn := v.Source.ScreenName
-      tw := v.TargetObject.Text
-      fmt.Printf("UnFavorited by %-15s: %s\n", sn, tw)
-    }
-  }
-}
-````
-
 
 
 Endpoints
diff --git a/twitter.go b/twitter.go
index 069d581..1777f70 100644
--- a/twitter.go
+++ b/twitter.go
@@ -31,7 +31,7 @@
 //
 //Endpoints
 //
-//Anaconda implements most of the endpoints defined in the Twitter API documentation: https://dev.twitter.com/docs/api/1.1.
+//Anaconda implements most of the endpoints defined in the Twitter API documentation: https://developer.twitter.com/en/docs
 //For clarity, in most cases, the function name is simply the name of the HTTP method and the endpoint (e.g., the endpoint `GET /friendships/incoming` is provided by the function `GetFriendshipsIncoming`).
 //
 //In a few cases, a shortened form has been chosen to make life easier (for example, retweeting is simply the function `Retweet`)
@@ -40,6 +40,7 @@
 package anaconda
 
 import (
+	"bytes"
 	"compress/zlib"
 	"encoding/json"
 	"fmt"
@@ -58,6 +59,7 @@ const (
 	_POST         = iota
 	_DELETE       = iota
 	_PUT          = iota
+	_GETBEARER    = iota
 	ClientTimeout = 20
 	BaseUrlV1     = "https://api.twitter.com/1"
 	BaseUrl       = "https://api.twitter.com/1.1"
@@ -71,6 +73,7 @@ var (
 type TwitterApi struct {
 	oauthClient          oauth.Client
 	Credentials          *oauth.Credentials
+	bearer               string
 	queryQueue           chan query
 	bucket               *tokenbucket.Bucket
 	returnRateLimitError bool
@@ -84,6 +87,13 @@ type TwitterApi struct {
 	// used for testing
 	// defaults to BaseUrl
 	baseUrl string
+
+	// environment name used by Premium Account Activity API
+	// Leave nil for Enterprise Account Activity API
+	env string
+
+	// Prefix used for Account Activity API.
+	activityUrl string
 }
 
 type query struct {
@@ -125,6 +135,8 @@ func NewTwitterApi(access_token string, access_token_secret string) *TwitterApi
 		HttpClient:           http.DefaultClient,
 		Log:                  silentLogger{},
 		baseUrl:              BaseUrl,
+		env:                  "",
+		activityUrl:          BaseUrl + "/account_activity/",
 	}
 	//Configure a timeout to HTTP client (DefaultClient has no default timeout, which may deadlock Mutex-wrapped uses of the lib.)
 	c.HttpClient.Timeout = time.Duration(ClientTimeout * time.Second)
@@ -142,13 +154,13 @@ func NewTwitterApiWithCredentials(access_token string, access_token_secret strin
 }
 
 //SetConsumerKey will set the application-specific consumer_key used in the initial OAuth process
-//This key is listed on https://dev.twitter.com/apps/YOUR_APP_ID/show
+//This key is listed on https://developer.twitter.com/en/apps/YOUR_APP_ID/show
 func SetConsumerKey(consumer_key string) {
 	oauthCredentials.Token = consumer_key
 }
 
 //SetConsumerSecret will set the application-specific secret used in the initial OAuth process
-//This secret is listed on https://dev.twitter.com/apps/YOUR_APP_ID/show
+//This secret is listed on https://deeloperv.twitter.com/en/apps/YOUR_APP_ID/show
 func SetConsumerSecret(consumer_secret string) {
 	oauthCredentials.Secret = consumer_secret
 }
@@ -183,6 +195,16 @@ func (c *TwitterApi) GetDelay() time.Duration {
 // SetBaseUrl is experimental and may be removed in future releases.
 func (c *TwitterApi) SetBaseUrl(baseUrl string) {
 	c.baseUrl = baseUrl
+	c.SetEnv(c.env) //propagate to activityUrl
+}
+
+// SetEnv sets the environment name used by Premium Account Activity API.
+func (c *TwitterApi) SetEnv(env string) {
+	c.env = env
+	c.activityUrl = c.baseUrl + "/account_activity/"
+	if env != "" {
+		c.activityUrl = c.activityUrl + "all/" + env + "/"
+	}
 }
 
 //AuthorizationURL generates the authorization URL for the first part of the OAuth handshake.
@@ -259,6 +281,41 @@ func (c TwitterApi) apiPut(urlStr string, form url.Values, data interface{}) err
 	return decodeResponse(resp, data)
 }
 
+// apiGetBearer issues a GET request with a bearer token. Done outside the oauth library because
+// it doesn't support bearer tokens currently.
+func (c TwitterApi) apiGetBearer(urlStr string, form url.Values, data interface{}) error {
+	// form is ignored
+	req, _ := http.NewRequest("GET", urlStr, nil)
+	if c.bearer == "" {
+		c.bearer, _ = c.GetBearerToken()
+	}
+
+	req.Header.Add("Authorization", "Bearer "+c.bearer)
+
+	resp, err := c.HttpClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	return decodeResponse(resp, data)
+}
+
+func (a TwitterApi) GetBearerToken() (tok string, err error) {
+	var bt BearerToken
+	client := &http.Client{}
+	req, err := http.NewRequest("POST", "https://api.twitter.com/oauth2/token", bytes.NewReader([]byte("grant_type=client_credentials")))
+	req.SetBasicAuth(a.oauthClient.Credentials.Token, a.oauthClient.Credentials.Secret)
+	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
+	resp, err := client.Do(req)
+	if err != nil {
+		return "", err
+	}
+	bodyText, err := ioutil.ReadAll(resp.Body)
+	err = json.Unmarshal(bodyText, &bt)
+
+	return bt.Token, err //Note that it is still in URL encoded form
+}
+
 // decodeResponse decodes the JSON response from the Twitter API.
 func decodeResponse(resp *http.Response, data interface{}) error {
 	// Prevent memory leak in the case where the Response.Body is not used.
@@ -279,7 +336,8 @@ func decodeResponse(resp *http.Response, data interface{}) error {
 	// according to dev.twitter.com, chunked upload append returns HTTP 2XX
 	// so we need a special case when decoding the response
 	if strings.HasSuffix(resp.Request.URL.String(), "upload.json") ||
-		strings.Contains(resp.Request.URL.String(), "webhooks") {
+		strings.Contains(resp.Request.URL.String(), "webhooks") ||
+		strings.Contains(resp.Request.URL.String(), "subscriptions") {
 		if resp.StatusCode == 204 {
 			// empty response, don't decode
 			return nil
@@ -316,6 +374,8 @@ func (c TwitterApi) execQuery(urlStr string, form url.Values, data interface{},
 		return c.apiDel(urlStr, form, data)
 	case _PUT:
 		return c.apiPut(urlStr, form, data)
+	case _GETBEARER:
+		return c.apiGetBearer(urlStr, form, data)
 	default:
 		return fmt.Errorf("HTTP method not yet supported")
 	}
diff --git a/webhook.go b/webhook.go
index 1dca990..bff9b49 100644
--- a/webhook.go
+++ b/webhook.go
@@ -1,17 +1,22 @@
 package anaconda
 
 import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+	"net/http"
 	"net/url"
 )
 
 //GetActivityWebhooks represents the twitter account_activity webhook
 //Returns all URLs and their statuses for the given app. Currently,
-//only one webhook URL can be registered to an application.
-//https://dev.twitter.com/webhooks/reference/get/account_activity/webhooks
+//only one webhook URL can be registered to an application except in the Enterprise API
+//https://developer.twitter.com/en/docs/accounts-and-users/subscribe-account-activity/api-reference/aaa-premium#get-account-activity-all-webhooks
 func (a TwitterApi) GetActivityWebhooks(v url.Values) (u []WebHookResp, err error) {
 	v = cleanValues(v)
 	responseCh := make(chan response)
-	a.queryQueue <- query{a.baseUrl + "/account_activity/webhooks.json", v, &u, _GET, responseCh}
+	a.queryQueue <- query{a.activityUrl + "webhooks.json", v, &u, _GET, responseCh}
 	return u, (<-responseCh).err
 }
 
@@ -23,63 +28,111 @@ type WebHookResp struct {
 	CreatedAt string
 }
 
+type BearerToken struct {
+	Type  string `json:"token_type"`
+	Token string `json:"access_token"`
+}
+
 //SetActivityWebhooks represents to set twitter account_activity webhook
 //Registers a new webhook URL for the given application context.
 //The URL will be validated via CRC request before saving. In case the validation fails,
-//a comprehensive error is returned. message to the requester.
-//Only one webhook URL can be registered to an application.
-//https://api.twitter.com/1.1/account_activity/webhooks.json
+//a comprehensive error message is returned to the requester.
+//Only one webhook URL can be registered to an application except in the Enterprise API.
+//https://developer.twitter.com/en/docs/accounts-and-users/subscribe-account-activity/api-reference/aaa-premium#post-account-activity-all-env-name-webhooks
 func (a TwitterApi) SetActivityWebhooks(v url.Values) (u WebHookResp, err error) {
 	v = cleanValues(v)
 	responseCh := make(chan response)
-	a.queryQueue <- query{a.baseUrl + "/account_activity/webhooks.json", v, &u, _POST, responseCh}
+	a.queryQueue <- query{a.activityUrl + "webhooks.json", v, &u, _POST, responseCh}
 	return u, (<-responseCh).err
 }
 
-//DeleteActivityWebhooks Removes the webhook from the provided application’s configuration.
-//https://dev.twitter.com/webhooks/reference/del/account_activity/webhooks
+//DeleteActivityWebhooks Removes a webhook from the provided application’s configuration.
+//https://developer.twitter.com/en/docs/accounts-and-users/subscribe-account-activity/api-reference/aaa-premium#delete-account-activity-all-env-name-webhooks-webhook-id
 func (a TwitterApi) DeleteActivityWebhooks(v url.Values, webhookID string) (u interface{}, err error) {
 	v = cleanValues(v)
 	responseCh := make(chan response)
-	a.queryQueue <- query{a.baseUrl + "/account_activity/webhooks/" + webhookID + ".json", v, &u, _DELETE, responseCh}
+	a.queryQueue <- query{a.activityUrl + "webhooks/" + webhookID + ".json", v, &u, _DELETE, responseCh}
 	return u, (<-responseCh).err
 }
 
-//PutActivityWebhooks update webhook which reenables the webhook by setting its status to valid.
-//https://dev.twitter.com/webhooks/reference/put/account_activity/webhooks
+//PutActivityWebhooks Updates a webhook by triggering a challenge response check (CRC) which, if
+//successful, sets its status to valid.
+//https://developer.twitter.com/en/docs/accounts-and-users/subscribe-account-activity/api-reference/aaa-premium#put-account-activity-all-env-name-webhooks-webhook-id
 func (a TwitterApi) PutActivityWebhooks(v url.Values, webhookID string) (u interface{}, err error) {
 	v = cleanValues(v)
 	responseCh := make(chan response)
-	a.queryQueue <- query{a.baseUrl + "/account_activity/webhooks/" + webhookID + ".json", v, &u, _PUT, responseCh}
+	a.queryQueue <- query{a.activityUrl + "webhooks/" + webhookID + ".json", v, &u, _PUT, responseCh}
 	return u, (<-responseCh).err
 }
 
 //SetWHSubscription Subscribes the provided app to events for the provided user context.
-//When subscribed, all DM events for the provided user will be sent to the app’s webhook via POST request.
-//https://dev.twitter.com/webhooks/reference/post/account_activity/webhooks/subscriptions
+//When subscribed, all events for the provided user will be sent to the app’s webhook via POST request.
+//https://developer.twitter.com/en/docs/accounts-and-users/subscribe-account-activity/api-reference/aaa-premium#post-account-activity-all-env-name-subscriptions
 func (a TwitterApi) SetWHSubscription(v url.Values, webhookID string) (u interface{}, err error) {
 	v = cleanValues(v)
 	responseCh := make(chan response)
-	a.queryQueue <- query{a.baseUrl + "/account_activity/webhooks/" + webhookID + "/subscriptions.json", v, &u, _POST, responseCh}
+	if a.env != "" {
+		a.queryQueue <- query{a.activityUrl + "subscriptions.json", v, &u, _POST, responseCh}
+	} else {
+		a.queryQueue <- query{a.activityUrl + "webhooks/" + webhookID + "/subscriptions/all.json", v, &u, _POST, responseCh}
+	}
 	return u, (<-responseCh).err
 }
 
-//GetWHSubscription Provides a way to determine if a webhook configuration is
-//subscribed to the provided user’s Direct Messages.
-//https://dev.twitter.com/webhooks/reference/get/account_activity/webhooks/subscriptions
+//GetWHSubscription Determines if a webhook configuration is subscribed to the provided user’s account
+//https://developer.twitter.com/en/docs/accounts-and-users/subscribe-account-activity/api-reference/aaa-premium#get-account-activity-all-env-name-subscriptions
 func (a TwitterApi) GetWHSubscription(v url.Values, webhookID string) (u interface{}, err error) {
 	v = cleanValues(v)
 	responseCh := make(chan response)
-	a.queryQueue <- query{a.baseUrl + "/account_activity/webhooks/" + webhookID + "/subscriptions.json", v, &u, _GET, responseCh}
+	if a.env != "" {
+		a.queryQueue <- query{a.activityUrl + "subscriptions.json", v, &u, _GET, responseCh}
+	} else {
+		a.queryQueue <- query{a.activityUrl + "webhooks/" + webhookID + "/subscriptions/all.json", v, &u, _GET, responseCh}
+	}
+	return u, (<-responseCh).err
+}
+
+//ListWHSubscriptions Returns a list of active subscriptions
+//https://developer.twitter.com/en/docs/accounts-and-users/subscribe-account-activity/api-reference/aaa-premium#get-account-activity-all-env-name-subscriptions-list
+func (a TwitterApi) ListWHSubscriptions(v url.Values) (u interface{}, err error) {
+	v = cleanValues(v)
+	responseCh := make(chan response)
+
+	a.queryQueue <- query{a.activityUrl + "subscriptions/list.json", v, &u, _GETBEARER, responseCh}
 	return u, (<-responseCh).err
 }
 
 //DeleteWHSubscription Deactivates subscription for the provided user context and app. After deactivation,
-//all DM events for the requesting user will no longer be sent to the webhook URL..
+//all events for the requesting user will no longer be sent to the webhook URL.
 //https://dev.twitter.com/webhooks/reference/del/account_activity/webhooks
 func (a TwitterApi) DeleteWHSubscription(v url.Values, webhookID string) (u interface{}, err error) {
 	v = cleanValues(v)
 	responseCh := make(chan response)
-	a.queryQueue <- query{a.baseUrl + "/account_activity/webhooks/" + webhookID + "/subscriptions.json", v, &u, _DELETE, responseCh}
+	if a.env != "" {
+		a.queryQueue <- query{a.activityUrl + "subscriptions.json", v, &u, _DELETE, responseCh}
+	} else {
+		a.queryQueue <- query{a.activityUrl + "webhooks/" + webhookID + "/subscriptions/all.json", v, &u, _DELETE, responseCh}
+	}
 	return u, (<-responseCh).err
 }
+
+//CountWHSubscriptions returns the count of subscriptions active on a given webhook
+//https://developer.twitter.com/en/docs/accounts-and-users/subscribe-account-activity/api-reference/aaa-premium#get-account-activity-all-subscriptions-count
+func (a TwitterApi) CountWHSubscriptions(v url.Values) (u interface{}, err error) {
+	v = cleanValues(v)
+	responseCh := make(chan response)
+	//note lack of environment name here, even for Premium
+
+	a.queryQueue <- query{a.baseUrl + "/account_activity/all/subscriptions/count.json", v, &u, _GETBEARER, responseCh}
+	return u, (<-responseCh).err
+}
+
+//RespondCRC responds to a CRC request from Twitter.
+//Should be called in response to a GET request to the callback URL.
+//https://developer.twitter.com/en/docs/accounts-and-users/subscribe-account-activity/guides/securing-webhooks
+func (a TwitterApi) RespondCRC(tok string, w http.ResponseWriter) {
+	mac := hmac.New(sha256.New, []byte(a.oauthClient.Credentials.Secret))
+	mac.Write([]byte(tok))
+	resp := "{ \"response_token\": \"sha256=" + base64.StdEncoding.EncodeToString(mac.Sum(nil)) + "\" }"
+	fmt.Fprint(w, resp)
+}