diff --git a/sync.sh b/sync.sh
index 37c27f3f..f55cd233 100755
--- a/sync.sh
+++ b/sync.sh
@@ -1,3 +1,20 @@
-#!/bin/bash
+#!/usr/bin/env bash
+set -euo pipefail
 
-curl -o ./resources/fingerprint-server-api.yaml https://fingerprintjs.github.io/fingerprint-pro-server-api-openapi/schemas/fingerprint-server-api-compact.yaml
+# Resolve paths relative to the repository root, so the script can be run from
+# any working directory.
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
+schemaUrl="${1:-https://fingerprintjs.github.io/openapi/schemas/fingerprint-server-api-compact.yaml}"
+
+CURL_OPTS=(-fSL --retry 3 --proto-redir '=https' --connect-timeout 10 --max-time 300)
+if [[ "${TRACE:-}" != "true" && "${ACTIONS_STEP_DEBUG:-}" != "true" ]]; then
+  CURL_OPTS+=(-s)
+fi
+
+mkdir -p ./resources
+
+echo "Downloading $schemaUrl"
+curl "${CURL_OPTS[@]}" -o ./resources/fingerprint-server-api.yaml "$schemaUrl"
+
+echo "OpenAPI schema download complete."