I have created sandboxie's developer account and got access_token. But when sandboxie's address calls api key, it prompts “Your OAuth2 token is incorrect or has expired ”
For general token issues:
Ecomm app permissions:
https://docs.clover.com/clover-platform/docs/ecommerce-app-permissions. Note, your app needs the PROCESS_CARDS permission to retrieve a pakms key. See the general token link above for instructions on uninstalling/reinstalling your app after you add the correct permissions.
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