Payment forwarding API
from bitaps_api import BitApsForwarding
api = BitApsForwarding(testnet=True)
# get forwarding address
res = api.generate_address()
# get address_state by access_token
res = api.generate_address(access_token='your token')
# get address_state by payment_code
res = api.generate_address(payment_code='your payment code')