Hi,
I can make the required WHMCS Module to integrate lookup of availability of .bd domain and whois integration with .bd domain registry. But this will be specific to whois lookup and not for overall integration of domain registration process.
Please let me know if you are interested, i have sufficient environment to develop and test it on WHMCS and when it ready I'll provide you instructions to integrate into your WHMCS installation.
Rest assure, I am also a Sr. Developer with over 16+ years experience in almost every language/framework and technology. You can check my profile for my skills. I am dedicated to my work and provide 100% customer satisfaction and on time delivery, you can review my profile and feedback for similar jobs. I also provide support for any issue if required after job is done to retain my clients to get more works and references.
Please let me know if you are interested, I'll be happy to start working on this.
Thanks & Regards
Sandeep Verma