Shopify.Multipass.get_keys

You're seeing just the function get_keys, go back to Shopify.Multipass module for more information.
Link to this function

get_keys(multipass_secret, block_size \\ 16)

Specs

get_keys(binary(), integer()) :: tuple()

Splits the multipass secret into 2 binaries, each containing exactly the block size number of bytes. Returns a tuple where the first item is the encryption_key, the second is the signature_key