Hey, @oya-luxe !
I’m glad to hear that you purchased a custom domain. Are you now trying to verify your domain with Facebook?
If so, keep in mind that the domain you’ll need to verify is your Primary domain. Your primary domain is the domain name that customers see in the address bar while they browse your online store, and this would typically be your custom domain, rather than your myshopify.com URL. If you aren’t sure which domain is currently set as your primary domain, you can find out by heading to Online store > Domains.
To verify your domain with Facebook, you’ll just need to select the DNS Verification method. Facebook has a help doc that walks you through the domain verification process here. This help doc also includes a video, which should make it easier to follow along. Since you purchased your domain through GoDaddy, it sounds like your DNS settings are also currently be managed through GoDaddy. With that being the case, you will need to edit the DNS settings directly through your GoDaddy account, by following Facebook’s instructions above.
If you run into any issues, I recommend taking a close look through this thread, as there are quite a few troubleshooting steps that have been outlined and those should help clear things up. Let me know how that goes!