Use your own checkout address
Point a subdomain like checkout.yourbrand.com at Payd with two DNS records. HTTPS comes automatically.
In Payd, open your store’s Checkout page, type a subdomain of your store, like
checkout.yourbrand.com, and click Save and check.Add the two records Payd shows (a CNAME pointing at Payd and a TXT record that proves the domain is yours) where your domain’s DNS is managed. If Shopify manages your domain: Settings → Domains → your domain → Domain settings → Edit DNS settings → Add custom record.
Open Settings → DomainsClick Check again. HTTPS is issued automatically once both records work; it can take up to 30 minutes.
Until then, buyers check out on Payd’s address. If you remove your address later, buyers check out on Payd’s address again.