# Sign Mandates

Once the account has been created with our banking partner, the seller must sign a direct debit mandate authorizing Unlimitd to debit the seller's external account. This signature is also valid for direct debits to the account previously created with Unlimitd's banking partner.

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<summary>signMandatesThroughPartnership <mark style="color:red;"><code>Mutation</code></mark></summary>

#### Variables

No variable

#### Returns

`signingUrl` - Url to redirect to to start the signature process&#x20;

#### Errors

<mark style="color:red;">**`400`**</mark> <mark style="color:red;">`IBAN_INVALID`</mark> - The given IBAN is invalid

<mark style="color:red;">**`400`**</mark> <mark style="color:red;">`MANDATES_ALREADY_SIGNED`</mark> - All mandates are already signed

#### Security

This endpoint is guarded by Seller Authentication. See [authenticate-as-seller](https://docs.unlimitd.com/authentication/authentication/authenticate-as-seller "mention")

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