Subject: How to Get Amazon SP-API client_id, client_secret, and refresh_token

Step 1: Login and Start App Registration

• Go to: https://sellercentral.amazon.com.mx
• Login with your developer/seller account.
• Navigate to: Apps & Services → Develop Apps → Add new app client . this will redirect you to https://solutionproviderportal.amazon.com/

Step 2: Fill App Information

• App Name: MagB1 App
• API Type: SP API
• Business Entities: Sellers (checked)
• Roles:
  • Pricing (checked)
  • Amazon Fulfillment (checked)
  • Product Listing (checked)
• Restricted Data Token:
  • Yes, I will delegate access to another developer's application (selected)
  • Professional Services (checked)
  • Direct-to-Consumer Shipping (checked)
  • Tax Remittance (checked)
  • Tax Invoicing (checked)

Click "Save and exit".

Step 3: View LWA Credentials

• Go back to the app list under Develop Apps.
• Under the "LWA credentials" column, click "View".
• Copy the values for:
  • client_id
  • client_secret
  • Redirect URI

Step 4: Authorize the App to Get the Refresh Token

• In the app list, click the dropdown next to "Edit App" and choose "Authorize".
• Login again and approve the permissions.
• You will be redirected to your Redirect URI with a code like: 
  ?spapi_oauth_code=your_code_here&state=xyz
• Copy the spapi_oauth_code value.

Step 5: Use Refresh Token to Get New Access Tokens

To refresh the access token:

POST to: https://api.amazon.com/auth/o2/token

With this body:

{
  "grant_type": "refresh_token",
  "refresh_token": "YOUR_REFRESH_TOKEN",
  "client_id": "YOUR_CLIENT_ID",
  "client_secret": "YOUR_CLIENT_SECRET"
}