# Notice of change - Enhancement to support '&' as a query separator in callback

Issued: 22nd February 2023 | TB-022223

### What's changing?

The query separator in the `redirectUrl` field of the [POST /token-requests](../../api/reference/Requests-for-Payments-v1-or-AIS#operation/GatewayService.StoreTokenRequest) call is changing to support `&` as a valid separator instead of `?` for authorization callback.

### What problem will this solve?

During payment initiation, certain banks are unable to use `?` in the `redirectUrl` field that defines the bank's callback url.

The query separator in the `redirectUrl` field is changing to support `&` as a valid separator instead of `?`.

For example:

`https://auth.token.io/callback?paymentId=test&state=dG9rZW5pby1zdGF0ZQ__`

will be handled as:

`https://auth.token.io/callback&paymentId=test&state=dG9rZW5pby1zdGF0ZQ__`

### Who's affected by this change?

This change will only affect customers using Token.io's Payment Initiation Services (PIS) for transactions with Banque Populaire, Caisse d’Epargne, Banque BCP, Banque Savoie (BPCE group).

For customers using Token.io callback, this change will be implemented automatically.

If you're using TPP callback, you'll need to implement the changes outlined below.

This change doesn't affect you if you're using Token.io's Account Information Service (AIS).

### What action do I need to take?

#### Customers using Token.io callback

This change has been implemented automatically and you don't need to make any changes on your side.

#### Customers using TPP callback

You'll need to implement changes on your side to support `{redirect_url}&...` for BPCE group transactions to work.

### What are the technical details of this change

For customers using Token.io callback we now support the following url schema:

`callback?.......`

`callback/bpce&.....` (for BCPE group)

Customers using TPP callback with need to handle these url schema:

`{redirect_url}?.....`

`{redirect_url}&.....` (for BPCE group)

### Where can I get further information?

For assistance with the above and other operational aspects of the Token.io Account-to-Account Infrastructure, please contact [Token Support](https://support.token.io/).