Reference
Remy Reference/admin/Add custom domain
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Add custom domain

Register a customer-owned hostname; an apex auto-creates the www pair.
admin.domains.customAdd("acme.com")

Register a customer-owned hostname. An apex auto-creates the www pair; each returned entry carries the DNS records the customer must add.

Parameters
hostname
string
RequiredThe hostname to register.
CLI
remy-admin domains custom add app.acme.com