You add a customer by its Pipedrive subdomain. The customer must have OneClick installed in its Pipedrive company.

Before you start, make sure that:

- The customer installed OneClick in its own Pipedrive company. If it did not install OneClick yet, pre-claim its
  subdomain on the Waitlist. See [Pre-claim a domain](/docs/partner-portal/waitlist/pre-claim-a-domain).
- You know the Pipedrive subdomain of the customer. The subdomain is the part before `.pipedrive.com`, for example
  `acme` in `acme.pipedrive.com`.

## Add the customer

1. In the sidebar, click **Customers**. The **Customers** page opens.
2. Click **Add new**. The window **Add new customer** opens.
3. In **Tenant subdomain**, type the Pipedrive subdomain of the customer. If you paste a full Pipedrive URL, the
   field keeps only the subdomain.
4. Click **Next**. The window shows the name and the subdomain of the company under **Organization**.
5. Make sure that the company is your customer. If it is not, click **Back** and type the subdomain again.
6. In **Seat limit (0 = unlimited)**, type the maximum number of customer users. Type `0` for no limit.
7. Click **Add customer**. The Partner Portal shows **Customer added.**

The customer is now a row on the **Customers** page. **Used** shows the seats that the customer uses. **Limit**
shows the seat limit. **∞** means no limit. See [How seats are counted](/docs/partner-portal/customers/how-seats-are-counted).

## If the customer does not add

The window **Add new customer** shows the error under the field:

- **Organization not found**: no company with this subdomain installed OneClick. Make sure that the subdomain is
  correct. If the company did not install OneClick yet, pre-claim its subdomain on the Waitlist.
- **Organization already added**: the company is already your customer.
- **Organization already assigned to another partner**: the company is a customer of another Partner. Contact Zimple
  support.
- **Seat limit cannot be lower than the currently assigned seats (N)**: the customer has more allowed customer users
  than the seat limit. `N` is the number of seats in use. Type a seat limit of `N` or more, or type `0`.
- **Organization not available — already assigned or missing**: between **Next** and **Add customer**, the company
  became a customer of a Partner, or it was removed. Close the window and add the customer again.

## Next steps

- [Allow or block a customer user](/docs/partner-portal/customers/allow-or-block-a-customer-user).
- [Customize the footer of a customer](/docs/partner-portal/customers/customize-the-footer-of-a-customer).
- [Copy a Button to a customer](/docs/partner-portal/buttons/copy-a-button-to-a-customer).