automatic park and map domain and whmcs mu provisioning product

Hello guys

I setup a whmcs mu provisioning and domain mapping with my wp mu and whmcs i want to sell wordpress blog on customers domain and i want it all automatic, my configs are ok, but at the final step we need to add A record or park domain in hosting control pannel (plesk or cpanel) to make wordpress domain mapping work, how i can set this final step automatic with my whmcs mu product?

Thank you for your helps
Best regards