diff --git a/libgm/payload/registerPhoneRelay.go b/libgm/payload/registerPhoneRelay.go
index 31d9bb2..3b08c69 100644
--- a/libgm/payload/registerPhoneRelay.go
+++ b/libgm/payload/registerPhoneRelay.go
@@ -43,7 +43,7 @@ func RegisterPhoneRelay(jwk *crypto.JWK) ([]byte, *binary.Container, error) {
 			},
 		},
 		BrowserDetails: &binary.BrowserDetails{
-			UserAgent: util.USER_AGENT,
+			UserAgent: util.UserAgent,
 			SomeInt:   2,
 			SomeBool:  true,
 			Os:        util.OS,
diff --git a/libgm/qr.go b/libgm/qr.go
index 9e4dd86..0ec837e 100644
--- a/libgm/qr.go
+++ b/libgm/qr.go
@@ -18,5 +18,5 @@ func (p *Pairer) GenerateQRCodeData() (string, error) {
 		return "", err
 	}
 	cData := base64.StdEncoding.EncodeToString(encodedUrlData)
-	return util.QR_CODE_URL + cData, nil
+	return util.QRCodeURLBase + cData, nil
 }
diff --git a/libgm/util/constants.go b/libgm/util/constants.go
index 3312fac..b547fe2 100644
--- a/libgm/util/constants.go
+++ b/libgm/util/constants.go
@@ -1,7 +1,7 @@
 package util
 
-var GOOG_API_KEY = "AIzaSyCA4RsOZUFrm9whhtGosPlJLmVPnfSHKz8"
-var USER_AGENT = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36"
-var OS = "Linux"
-var X_USER_AGENT = "grpc-web-javascript/0.1"
-var QR_CODE_URL = "https://support.google.com/messages/?p=web_computer#?c="
+const GoogleAPIKey = "AIzaSyCA4RsOZUFrm9whhtGosPlJLmVPnfSHKz8"
+const UserAgent = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36"
+const OS = "Linux"
+const XUserAgent = "grpc-web-javascript/0.1"
+const QRCodeURLBase = "https://support.google.com/messages/?p=web_computer#?c="
diff --git a/libgm/util/func.go b/libgm/util/func.go
index 90c5800..7fc746a 100644
--- a/libgm/util/func.go
+++ b/libgm/util/func.go
@@ -64,13 +64,13 @@ func BuildRelayHeaders(req *http.Request, contentType string, accept string) {
 	req.Header.Add("host", "instantmessaging-pa.googleapis.com")
 	req.Header.Add("connection", "keep-alive")
 	req.Header.Add("sec-ch-ua", "\"Google Chrome\";v=\"113\", \"Chromium\";v=\"113\", \"Not-A.Brand\";v=\"24\"")
-	req.Header.Add("x-user-agent", X_USER_AGENT)
-	req.Header.Add("x-goog-api-key", GOOG_API_KEY)
+	req.Header.Add("x-user-agent", XUserAgent)
+	req.Header.Add("x-goog-api-key", GoogleAPIKey)
 	if len(contentType) > 0 {
 		req.Header.Add("content-type", contentType)
 	}
 	req.Header.Add("sec-ch-ua-mobile", "?0")
-	req.Header.Add("user-agent", USER_AGENT)
+	req.Header.Add("user-agent", UserAgent)
 	req.Header.Add("sec-ch-ua-platform", "\""+OS+"\"")
 	req.Header.Add("accept", accept)
 	req.Header.Add("origin", "https://messages.google.com")
@@ -87,7 +87,7 @@ func BuildUploadHeaders(req *http.Request, metadata string) {
 	req.Header.Add("x-goog-download-metadata", metadata)
 	req.Header.Add("sec-ch-ua", "\"Google Chrome\";v=\"113\", \"Chromium\";v=\"113\", \"Not-A.Brand\";v=\"24\"")
 	req.Header.Add("sec-ch-ua-mobile", "?0")
-	req.Header.Add("user-agent", USER_AGENT)
+	req.Header.Add("user-agent", UserAgent)
 	req.Header.Add("sec-ch-ua-platform", "\""+OS+"\"")
 	req.Header.Add("accept", "*/*")
 	req.Header.Add("origin", "https://messages.google.com")
@@ -110,7 +110,7 @@ func NewMediaUploadHeaders(imageSize string, command string, uploadOffset string
 	}
 	headers.Add("x-goog-upload-header-content-length", imageSize)
 	headers.Add("sec-ch-ua-mobile", "?0")
-	headers.Add("user-agent", USER_AGENT)
+	headers.Add("user-agent", UserAgent)
 	if imageContentType != "" {
 		headers.Add("x-goog-upload-header-content-type", imageContentType)
 	}
diff --git a/libgm/util/structs.go b/libgm/util/structs.go
index f1f5b54..86eff61 100644
--- a/libgm/util/structs.go
+++ b/libgm/util/structs.go
@@ -32,7 +32,7 @@ func (h *Headers) Build() {
 	h.SecChUaMobile = "?0"
 	h.SecChUaPlatform = `"Linux"`
 	h.UpgradeInsecureRequests = "1"
-	h.UserAgent = USER_AGENT
+	h.UserAgent = UserAgent
 	h.Accept = `text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7`
 	h.SecFetchSite = "none"
 	h.SecFetchMode = "navigate"