API-key instead of username/password

[thecite]

I'm going through your tutorial at the moment, but have run into trouble regarding the code below.
My Watson Assistant and Language Translation services use API-key credentials instead of username/password (I believe this is due to a recent IBM Cloud update?).
How would I edit the code below to account for API-key credentials instead of username/password?

Would greatly appreciate your help,
regards.

`# set up conversation
try:
convCreds = params['__bx_creds']['conversation']
conversation = ConversationV1(
username=convCreds['username'],
password=convCreds['password'],
version='2018-02-16'
)
except:
return {
'message': 'Please bind your conversation service',
'context': '{}',
'output': '{}',
'intents': '{}',
'language': ''
}

# set up translator
try:
    ltCreds = params['__bx_creds']['language_translator']
    translator = LanguageTranslatorV3(
        version='2018-05-01',
        username=ltCreds['username'],
        password=ltCreds['password']
    )
except:
    return {
        'message': 'Please bind your language translator service',
        'context': '{}',
        'output': '{}',
        'intents': '{}',
        'language': ''

}`