A user arrived at inacademia.org after receiving an error during a transaction with a retailer or service: why is that and what happens next?

A user might see one of the following messages. The user should follow the on-screen instructions and refer back to the retailer or service that they were attempting to order a product or service from, as it will be necessary to re-start the process or to validate eligibility in a different way.

• Error: client ID missing or client not registered
• Error: missing or misconfigured redirect URL
• Error: unable to retrieve state
• Error: transaction already completed
• Unknown Error