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How to add the API key to Endicia

  1. Step 1: Request Your Endicia API Credentials
    • Visit Endicia’s API request form:
      Endicia Label Server Inquiry Form
    • In the form, mention that you already have your callback URLs. These will be provided to you by Mantle and typically look like this:
      https://www.yourstore.mantlestores.com/avalue/aversion/stamps/tokenid
      (Note: This is a sample format. We’ll give you your exact callback URLs when needed.)
    • Submit the completed form to Endicia.
  2. Step 2: Wait for Endicia’s Response
    You will receive an email from developersupport@stamps.com that contains:

    • Your Client ID
    • Your Client Secret
    • Confirmation that your callback URLs have been added

    Keep this email safe — you’ll need this information to complete the integration.

  3. Step 3: Enter Your Credentials in Mantle
    Once you have your Client ID and Secret:

    • Log into your Mantle account.
    • In the left-hand menu, click Settings.
    • From the submenu that appears, scroll down and select Endicia Settings.
    • Under the Authentication tab (the first tab that appears), enter your:
      • Client ID
      • Client Secret

      Your Endicia integration should now be active and ready to use!

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