Signup+ errors

The Signup+ API returns a Problem JSON for client usage and server-side processing errors.

The information returned includes the following fields:

Field	Always returned?	Description
`type`	Yes	A link to documentation about the error.
`title`	Yes	A short summary of the error.
`status`	Yes	The HTTP status code for the error.
`detail`	No	A more detailed explanation of the error.
`trace_id`	Yes	The TrueLayer trace identifier for the request.
`instance`	No	An absolute URI that identifies the specific occurrence of the problem.
`errors`	No	A description of what went wrong and where.

Below is an example of a Signup+ error response.

{
    "type": "https://docs.truelayer.com/docs/signup-errors#failed-payment",
    "title": "Failed Payment",
    "status": 422,
    "detail": "Cannot process failed payments",
    "instance": "/signup-plus/payments",
    "trace_id": "149c0d43-aaa0-4e46-9add-ea80b7697f28"
}

Universal errors

You can receive the following errors with the payments only, data only and VRP flows.

HTTP Status	Title	Retry	How to handle
400	Invalid Parameters	No	Check the error object for details of which fields are invalid.
400	Provider not supported	No	The provider doesn't support this operation.
401	Unauthorized	No	Create a new access token. The access token may be invalid or expired. You can check for more details in the error description.
403	Forbidden	No	Ask the user to reconnect their account. This error is returned when the access to their account is no longer valid, either because it expired or because the user revoked it themselves.
422	User Data Not Found	No	User data not found.
422	Joint Accounts Not Supported	No	Joint accounts not supported.
500	Internal server error	Yes	Retry later.

Payments-only errors

Requests you make to the Signup+ with the payments only flow can return the unique errors below.

HTTP Status	Title	Retry	How to handle
404	Payment Not Found	No	The payment `id` supplied does not match the `client_id` that is being used to call Signup+. Either the payment has been made with a different `client_id` or has not been processed. Ensure that the payment is made with the right `client_id` and try again.
422	Invalid Payment	No	Payment is not a closed-loop payment.
422	Payment Processing	Yes	Payment is still in progress. Retry when payment is processed or reached a terminal state.
422	Failed Payment	No	Cannot retrieve data from a `failed` or `rejected` payment.

Data-only errors

Requests you make to Signup+ using the data only flow can return the responses and errors below.

HTTP Status	Title	Retry	How to handle
403	Missing Claims	No	Add the missing claims to the access token.
422	No Valid Accounts	No	User has given permission to access an invalid account. This usually occurs because they don't have a current account with that provider.
504	Provider Timeout	Yes	The bank is experiencing issues. Retry later.

Variable recurring payments errors

Requests you make to Signup+ using the VRP integration can return the responses and errors below.

HTTP Status	Title	Retry	How to handle
404	Mandate Not Found	No	The mandate `id` supplied may not match the `client_id` that is being used to call Signup+. Either the mandate has been made with a different `client_id` or has not been processed. Ensure that the mandate is made with the right `client_id` and try again.
422	Invalid Mandate State	No	The mandate must be authorised.
422	Mandate Revoked	Yes	The mandate cannot have a status of revoked.