WHMCS

Transfer domain between registrars

For example, transfer an existing domain registration from OpenSRS to Enom.
Go to Clients > Domain Registrations and select the desired domain.
Uncheck Registrar Lock.
Click Save Changes.
Click Modify Contact Details. Change the registrant email address to your address. Click Save Changes. Return to the client’s Domains tab and click Get EPP Code. Note the displayed EPP code. Select the new domain registrar from the Registrar menu & SAVE. Click Transfer. You will see a confirmation message indicating that the transfer initiated successfully. The client’s Domains tab may display an error message from the new registrar, but this will disappear when the transfer process is complete. After the transfer process is complete, click Modify Contact Details, change the registrant email address back to the client’s own address, and click Save Changes.

NOTES:

   Modify contact details to avoid client having to handle confirmation emails. If you leave contact details as-is the client will receive one or more confirmation emails.  
   This procedure did not bill for the transfer. Normally we will want to charge the client for a  "renewal" as part of this transfer  
   After transferring or changing contact info there may be an email requiring confirmation of new contact info. It is required to approve these or the domain gets suspended.