Register Signer with Warpcast

curl --request POST \
  --url https://api.pinata.cloud/v3/farcaster/register_signer_with_warpcast \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "signer_id": "<string>",
  "signature": "<string>",
  "deadline": 123,
  "app_fid": 123,
  "app_address": "<string>"
}'

{
  "data": {
    "signer_id": "ea79206f-228e-4ca6-82e6-95e6acc76860",
    "token": "0xe2a4f68bea6c78ea5980e3b9",
    "deep_link_url": "farcaster://signed-key-request?token=0xe2a4f68bea6c78ea5980e3b9",
    "status": "pending_approval"
  }
}