Fix spelling and update OpenSign API documentation

Corrected the spelling of 'developer' in the API documentation and removed the auto mocking server entry.

docs/docs/API-docs/v1.1/opensign.yaml

@@ -6076,7 +6076,7 @@ components:
           example: true
         timeToCompleteDays:
           type: number
-          description: time to complete days is used to calculate expiry date of your document
+          description: time to complete days is used to calculate expiry date of your document. If this field is present in the request body, it overrides the template value, even when set to 0. If omitted, the template value is used.
           format: number
           example: 15
         enableOTP:
@@ -6110,7 +6110,7 @@ components:
             The email address of the person or organization that users can reply to. If this field is present in the request body, it overrides the template value, even when set to an empty string (""). If omitted, the template value is used.
 
             If nothing is set, it will use the owner’s preferences. If the owner’s preferences are also not set, it will default to "".
-            
+
           example: mailer@opensignlabs.com
         allow_modifications:
           type: boolean
@@ -6132,7 +6132,7 @@ components:
           example: false
         remind_once_in_every:
           type: number
-          description: "Number of days between reminders. This is only applicable when auto_reminder is set to true."
+          description: Number of days between reminders. This is only applicable when auto_reminder is set to true.  If this field is present in the request body, it overrides the template value, even when set to 0. If omitted, the template value is used.
           example: 5
         merge_certificate: 
           type: boolean
@@ -6169,7 +6169,7 @@ components:
           description: |
             bcc (blind carbon copy): Users added here will receive a notification email once the document is completed.
             If this field is present in the request body, it overrides the template value, even when provided as an empty array ([]).
-            If omitted, the template value is used.
+            If omitted or provided empty string ("") the template value is used.
         prefill: 
           type: object
           properties:

docs/docs/help/Settings/APIToken.md

@@ -89,9 +89,28 @@ OpenSign provides a **sandbox testing cloud environment**, which is a replica of
 > ⚠️ **Important Note:**  
 > Manually entering your username and password will **not work** for sandbox login. Always use the "Login to Sandbox" button for access.
 ---
-### Buy the api credit 
-User can buy the api credit using this feature 
-On the click of the buy premium credits.
+### Buy API Credits
+
+Follow these steps to purchase premium API credits:
+
+1. **Navigate to the Purchase Page**  
+   Go to **Settings → API Token → Buy Premium Credits**.
+   
+<img width="436" alt="buy premium credits" src="https://github.com/user-attachments/assets/82d7c571-702f-4f7f-83eb-baa86a63b829" />
+
+3. **Select the Number of Credits**  
+   Choose the number of credits you wish to purchase and click **Proceed**.
+   
+   <img width="436" alt="buy premium credits" src="https://github.com/user-attachments/assets/da7f72e6-84be-481b-9f5d-36bffafb11ae" />
+
+5. **Credits Added to Your Account**  
+   The selected credits are instantly added to your account. You can view the updated balance in the **Premium Credits Available** section.
+
+6. **Payment and Invoice**  
+   A **payment link** and **invoice** will be sent to your registered email address.
+
+7. **Complete the Payment**  
+   Open the email and click the **Buy Now** button to access the payment link and complete the transaction.
 
 ## 🧠 Frequently Asked Questions