API authentication is performed using the HMAC request signature sent in the Authorization header.

curl -X POST \ \
  -H 'Authorization: HMAC DjlHuWlApznJ7vrhPBL0fA:N2eEvkJQ07EpFau90pL5xMpBO3g=' \
  -H 'Content-Type: application/json' \
  -H 'Date: Tue, 25 Sep 2018 17:41:40 GMT' \
  -d '{"price_amount":"100","price_currency":"EUR","pay_currency":"BTC"}'  

HMAC-SHA1 is an algorithm defined by RFC 2104 — Keyed-Hashing for Message Authentication. The algorithm takes as input two byte-strings, a key and a message.

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