Validate Session

curl --request POST \
  --url https://api.authsignal.com/v1/sessions/validate \
  --header 'Content-Type: application/json' \
  --data '{
  "accessToken": "eyJhbGciOiJ...",
  "clientIds": [
    "64818035-68c3-4087-a449-bdd176a166c4"
  ]
}'

{
  "user": {},
  "expiresAt": 123
}