Authentication
Every request is signed with HMAC-SHA256 of the raw body plus a UNIX timestamp, using your API secret.
Headers
http
Authorization: Bearer pe_live_<key_id>
X-PE-Timestamp: 1718900000
X-PE-Signature: <hex_hmac_sha256>Signature
pseudo
sig = HMAC_SHA256(secret, timestamp + "." + raw_body)