diff --git a/README.md b/README.md
index 8541e22..78f1000 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,14 @@ dependencies {
         password = "**Your Password**", 
         logging = true
     )
+
+    //With Access or OAUTH2 Token
+    val client = ZammadClient(
+        baseurl = "**Zammad Url (https:// included)**",
+        token = "**Your Http Access or OAUTH2 Token**",
+        authType = "**Auth Type from utils/Constants **",
+        logging = true
+    )
 ```
 
 ### Use the Client.
diff --git a/lib/src/main/java/com/kirkbushman/zammad/ZammadClient.kt b/lib/src/main/java/com/kirkbushman/zammad/ZammadClient.kt
index 112ce26..b807099 100644
--- a/lib/src/main/java/com/kirkbushman/zammad/ZammadClient.kt
+++ b/lib/src/main/java/com/kirkbushman/zammad/ZammadClient.kt
@@ -5,6 +5,7 @@ import android.util.Log
 import com.kirkbushman.zammad.models.*
 import com.kirkbushman.zammad.models.compat.TicketArticleCompat
 import com.kirkbushman.zammad.models.compat.TicketCompat
+import com.kirkbushman.zammad.utils.Constants
 import com.kirkbushman.zammad.utils.Utils.buildRetrofit
 import retrofit2.Retrofit
 
@@ -13,10 +14,12 @@ class ZammadClient(
     baseUrl: String,
 
     private val auth: String,
+    private val authType: Int,
     private val logging: Boolean
 ) {
 
-    constructor(baseUrl: String, username: String, password: String, logging: Boolean) : this(baseUrl, "$username:$password", logging)
+    constructor(baseUrl: String, username: String, password: String, logging: Boolean) : this(baseUrl, "$username:$password",
+        Constants.AUTH_TYPE_USERNAME_PASSWORD, logging)
 
     companion object {
 
@@ -1285,6 +1288,10 @@ class ZammadClient(
     }
 
     private fun getHeaderMap(): HashMap<String, String> {
-        return hashMapOf("Authorization" to "Basic ".plus(String(Base64.encode(auth.toByteArray(), Base64.NO_WRAP))))
+        return when (authType) {
+            Constants.AUTH_TYPE_ACCESS_TOKEN -> hashMapOf("Authorization" to "Token token=".plus(auth))
+            Constants.AUTH_TYPE_OAUTH2 -> hashMapOf("Authorization" to "Bearer ".plus(auth))
+            else -> hashMapOf("Authorization" to "Basic ".plus(String(Base64.encode(auth.toByteArray(), Base64.NO_WRAP))))
+        }
     }
 }
diff --git a/lib/src/main/java/com/kirkbushman/zammad/utils/Constants.kt b/lib/src/main/java/com/kirkbushman/zammad/utils/Constants.kt
new file mode 100644
index 0000000..9f608ea
--- /dev/null
+++ b/lib/src/main/java/com/kirkbushman/zammad/utils/Constants.kt
@@ -0,0 +1,7 @@
+package com.kirkbushman.zammad.utils
+
+object Constants {
+    const val AUTH_TYPE_USERNAME_PASSWORD = 0
+    const val AUTH_TYPE_ACCESS_TOKEN = 1
+    const val AUTH_TYPE_OAUTH2 = 2
+}
\ No newline at end of file