diff --git a/package.json b/package.json
index 6fec58a..b0a5c9f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "obp-typescript",
-  "version": "1.0.33",
+  "version": "1.0.36",
   "license": "Apache-2.0",
   "scripts": {
     "build": "tsc --declaration && tsc-alias",
diff --git a/src/api/client.ts b/src/api/client.ts
index 6bf88e0..e32ec1f 100644
--- a/src/api/client.ts
+++ b/src/api/client.ts
@@ -236,7 +236,6 @@ const getDirectLoginToken = async (
   config: APIClientConfig
 ): Promise<string> => {
   if (!config.authentication) {
-    console.warn("Authentication is not set.");
     return "";
   }
   const loginUri = config.baseUri + "/my/logins/direct";
@@ -244,12 +243,13 @@ const getDirectLoginToken = async (
   const password = config.authentication.password;
   const consumerKey = config.authentication.consumerKey;
   const directLogin = `DirectLogin username=${username},password=${password},consumer_key=${consumerKey}`;
+  const authorization = directLogin ? { Authorization: directLogin } : {};
   const response = JSON.parse(
     (
       await superagent
         .post(loginUri)
         .set("Content-Type", "application/json")
-        .set("Authorization", directLogin)
+        .set(authorization)
     ).text
   );
   return "DirectLogin token=" + response.token;
@@ -284,6 +284,23 @@ const getOauthHeader = async (
   return header;
 };
 
+/**
+ * Get the Authorization header.
+ *
+ * @param header - The OAuth header value
+ * @returns An {object} value
+ *
+ *
+ * @private
+ */
+const getValidHeader = (header: string): any => {
+  if (header) {
+    return { Authorization: header, "Content-Type": "application/json" };
+  } else {
+    return { "Content-Type": "application/json" };
+  }
+};
+
 /**
  * Send a GET HTTP request and returns a response.
  *
@@ -303,7 +320,7 @@ export const getRequest = async (
   return (
     await superagent
       .get(pathUri)
-      .set("Authorization", header)
+      .set(getValidHeader(header))
       .catch((error) => error.response)
   ).body;
 };
@@ -330,7 +347,7 @@ export const postRequest = async (
   return (
     await superagent
       .post(pathUri)
-      .set("Authorization", header)
+      .set(getValidHeader(header))
       .send(body)
       .catch((error) => error.response)
   ).body;
@@ -358,7 +375,7 @@ export const putRequest = async (
   return (
     await superagent
       .put(pathUri)
-      .set("Authorization", header)
+      .set(getValidHeader(header))
       .send(body)
       .catch((error) => error.response)
   ).body;
@@ -385,7 +402,7 @@ export const deleteRequest = async (
   return (
     await superagent
       .delete(pathUri)
-      .set("Authorization", header)
+      .set(getValidHeader(header))
       .catch((error) => error.response)
   ).body;
 };
diff --git a/src/auth/index.ts b/src/auth/index.ts
index f44d369..ace14b2 100644
--- a/src/auth/index.ts
+++ b/src/auth/index.ts
@@ -111,8 +111,6 @@ export class OAuth {
    * @public
    */
   authHeader(pathUri: string, method: string): string {
-    if (!this.config.accessToken) console.warn("Access token is not set.");
-
     if (this.config.accessToken) {
       return this.instance.authHeader(
         pathUri,