> For the complete documentation index, see [llms.txt](https://docs.unlimitd.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.unlimitd.com/seller-onboarding/sign-mandates.md).

# Sign Mandates

To benefit from the advance payment of orders, all sellers must be onboarded. Onboarding takes place in 3 stages, each dependent on the other.

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.

<details>

<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](/authentication/authentication/authenticate-as-seller.md)

</details>