Create Custom Domain for Gateway

curl --request POST \
  --url https://api.pinata.cloud/v3/ipfs/gateways/{id}/custom_domain \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "domain": "ipfs2.pinata.cloud"
}'

{
  "data": {
    "domain": "ipfs2.pinata.cloud",
    "domain_validation_status": "pending",
    "custom_domain_id": "81bc0135-346d-4d81-ad81-1e313297702f",
    "ssl_validation_status": "initializing"
  }
}