feat: getAccessToken() method

README.md

@@ -65,6 +65,14 @@ gp.getTokens();
 }
 ```
 
+### getAccessToken()
+
+```ts
+gp.getAccessToken();
+```
+
+Returns only `access_token` for necessary Authorization
+
 ## 🙅🏿‍♂️ Used OSS
 
 - Chalk

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@fronebdev/gopay-js",
-  "version": "1.0.3",
+  "version": "1.0.4",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "repository": {

src/factory/goPay.ts

@@ -48,4 +48,28 @@ export class goPay {
 
     return res.data;
   }
+
+  async getAccessToken() {
+    const params = new URLSearchParams();
+    params.append("grant_type", "client_credentials");
+    params.append("scope", "payment-create");
+
+    const res = await axios({
+      url: this.url + "/oauth2/token",
+      method: "POST",
+      headers: {
+        Accept: "application/json",
+        "Content-Type": "application/x-www-form-urlencoded",
+        Authorization:
+          "Basic " +
+          new Buffer(
+            this.credentials.clientID + ":" + this.credentials.clientSecret
+          ).toString("base64"),
+      },
+      data: params,
+    });
+
+    return res.data.access_token;
+  }
+
 }