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Authentication Requests for calling an API can be authenticated using either of the following methods: AK/SK authentication: Requests are encrypted using AK/SK pairs. AK/SK authentication is recommended because it is more secure than token authentication.
The public key decrypts the encrypted hash sent. The receiving server computes its own hash and compares it with the one received in the message. If the two match, the message is let through, meaning that the mail has not been tampered with and its source is authentic.