Module tests 

Functions

build_client 🔒

derive_chacha_key 🔒

get_gateway 🔒

pay_once 🔒

receive 🔒

receive_and_pay 🔒

receive_once 🔒

send_and_recv_ecash_once 🔒

send_ecash_exact 🔒

test_ecash 🔒

test_ecash_exact 🔒