Exchangerates-API requieres access key

[ebnermic]

Exchangrerates API requieres an access key to work. It does not work anymore since 01.04.2021 without this key.

The README has been enhanced as well to show the users how to implement and test it.

Description of change

• Changed the base url to "HTTP" instead of "HTTPS" as the lowest plan (Free plan) from exchangeratesapi.io only provieds "HTTP"
• Added access_key as parameter in do_sync and used this parameter in the request method
• Added payload logging to be able to trace the responses and understand what has been done
• Read access_key from config file and pass it as parameter in do_sync call

Manual QA steps

• Tested locally

Risks

• Error while executing without api_key but users without the API key will not be able to run this tap anyway.

Rollback steps

• revert this branch

[cmerrick]

Hi @ebnermic, thanks for your contribution!

In order for us to evaluate and accept your PR, we ask that you sign a contribution license agreement. It's all electronic and will take just minutes.

[cmerrick]

You did it @ebnermic!

Thank you for signing the Singer Contribution License Agreement.

[RuslanBergenov]

@ebnermic, thanks for looking into this issue. I I just tested your master branch and got this error:

INFO Replicating exchange rate data from 2021-05-01 using base CAD
INFO {'success': False, 'error': {'code': 105, 'type': 'base_currency_access_restricted'}}
Traceback (most recent call last):
  File "{my_dir}/virtualenv_exchangerates/bin/tap-exchangeratesapi", line 11, in <module>
    load_entry_point('tap-exchangeratesapi==0.1.1', 'console_scripts', 'tap-exchangeratesapi')()
  File "{my_dir}/virtualenv_exchangerates/lib/python3.7/site-packages/tap_exchangeratesapi/
__init__.py", line 118, in main
    do_sync(config.get('base', 'USD'), start_date, access_key)
  File "{my_dir}/virtualenv_exchangerates/lib/python3.7/site-packages/tap_exchangeratesapi/
__init__.py", line 66, in do_sync
    for rate in payload['rates']:
KeyError: 'rates'

my tap-config is:
{ "base": "CAD",
"start_date": "2021-05-01",
"access_key": "{my_key}"
}

[ebnermic]

@RuslanBergenov this error is right. As you only have the free plan, your api key does not support any other base currency. The base currency for the free plan is EUR. On the pricing page you can see, that only "basic" and above plans get you "source currency switching"
https://exchangeratesapi.io/pricing/