Build on RegEngine

export REGENGINE_API_KEY="rge_live_..."      # from RegEngine
export REGENGINE_SIGNING_SECRET="..."       # from RegEngine

NOW=$(date -u +%Y-%m-%dT%H:%M:%SZ)
TODAY=$(date -u +%Y-%m-%d)

BODY=$(cat <<EOF
{
  "source": "<your source system id>",
  "events": [
    {
      "cte_type": "receiving",
      "traceability_lot_code": "<the lot code you assigned>",
      "product_description": "<product name>",
      "quantity": "<number greater than 0>",
      "unit_of_measure": "<cases | lbs | kg | pallets | each>",
      "location_name": "<your facility name>",
      "timestamp": "$NOW",
      "kdes": {
        "receive_date": "$TODAY",
        "receiving_location": "<where the lot arrived>",
        "immediate_previous_source": "<who sent it to you>",
        "reference_document": "<your ASN or receipt id>",
        "tlc_source_reference": "<the lot reference your supplier gave you>"
      }
    }
  ]
}
EOF
)

# Sign the exact bytes you send: sha256= plus the HMAC-SHA256 hex digest.
SIGNATURE="sha256=$(printf '%s' "$BODY" | openssl dgst -sha256 -hmac "$REGENGINE_SIGNING_SECRET" -hex | sed 's/^.* //')"

curl -X POST https://regengine.co/api/v1/webhooks/ingest \
  -H "X-RegEngine-API-Key: $REGENGINE_API_KEY" \
  -H "X-Webhook-Signature: $SIGNATURE" \
  -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  --data-binary "$BODY"