• You need to login - your admin session expired while the page was open. Reload and sign in again.
• Invalid Permissions - your role lacks the Integrations permission (on the onboarding page: you are not an administrator or onboarding user). Ask an administrator to add the permission under User Roles.
• Invalid integration id - the card number in the link does not exist (for example a card that is switched off in your version).
• Custom tax calculation systems are disabled. - you tried to change TTR states while Enable Custom Tax Calculation Systems is No for that kitchen.
• Forbidden reseller - you tried to save a per-kitchen setting for a kitchen your account cannot access.

These messages appear in a red banner near the top of the page and the popup window closes.