Error handling in the readme

[s3bw]

These raised exceptions do not have amessage attribute. Thus the log message in the readme fails with AttributeError.

Also the exception definition doesn't contain an error_code attribute

except sdk.errors.CheckoutSdkError as e:
    print('{0.http_status} {0.error_code} {0.elapsed} {0.event_id} // {0.message}'.format(e))

https://github.com/checkout/checkout-sdk-python#payment-request-example-with-n3d-downgrade-option

Also 'error_codes' seems like a valuable attribute to have on the error logging e.g: ['customer_id_invalid', 'destination_token_invalid']

[match-cheng]

The sdk seems ok - there are some minor bugs in the sdk that will be addressed.
Since we are using dynamic attributes so the 3ds should be accessed with this:

print ( payment['3ds'].downgraded) instead of print ( payment.3ds.downgraded)

[s3bw]

Are you able to access these attributes on the exception?

print('{0.http_status} {0.error_code} {0.elapsed} {0.event_id} // {0.message}'.format(e))

[match-cheng]

Please replace the exception into the below and it should work.

print('{0.http_status} {0.error_codes} {0.elapsed} {0.request_id} - {0.error_type}'.format(e))