curl -X DELETE https://api.chargeapi.co/v1/fleets/flt_SJVjnkVAOu40QMHqVlIKtKGg9M0Fvpju \
  -H "Authorization: Bearer ch_sk_test_..."

{
    "id": "flt_SJVjnkVAOu40QMHqVlIKtKGg9M0Fvpju",
    "object": "fleet",
    "deleted": true
}