# Onboarding
The primary method for onboarding new sub-merchants is through our **Referral Signup Link**.
Once your platform is eligible, your account manager will provide a unique URL. You should present this link to the clients you wish to onboard as sub-merchants.
When your client uses this link, the form will:
* [x] Collect all the necessary information to create their merchant account.
* [x] Automatically apply all required configurations for them to start processing payments.
The form is mobile-responsive and can be embedded directly into your platform using an `iframe` for a seamless user experience.
### Matching Submerchants with your system
To easily track and match a new sub-merchant with the corresponding user in your own system, you can add a **query parameter** to the referral URL.
Append the **`externalSubMerchantId`** parameter to the end of the URL you received, using your internal identifier for that user.
Format:
**`&externalSubMerchantId=`**`{YourUniqueSubMerchantID}`
Example: If your referral URL is `https://example.onekeypayments.com/referral?id=XYZ123` and your internal user ID is `user-9876`, the final URL would be:
`https://example.onekeypayments.com/referral?id=XYZ123&`**`externalSubMerchantId=user-9876`**
### Onboarding confirmation
After a submerchant successfully completes the signup form, you will receive a webhook Notification confirming that their account has been created.
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