Create a new service registration

curl --request POST \
  --url https://commerce1.on-hellgate.dev/service-registrations \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "schema": {},
  "service": "<string>",
  "service_type": "<string>",
  "version": "<string>",
  "capabilities": [
    "ACH"
  ],
  "singleton": true
}
'

{
  "capabilities": [
    "ACH"
  ],
  "created_at": "2023-11-07T05:31:56Z",
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "schema": {},
  "service": "<string>",
  "service_type": "API",
  "singleton": true,
  "version": "<string>"
}