DJMERCADOPAGO_CLIENT_ID = 'your-mp-client-id'
DJMERCADOPAGO_CLIENTE_SECRET = 'your-mp-secret'
DJMERCADOPAGO_SANDBOX_MODE = True
DJMERCADOPAGO_CHECKOUT_PREFERENCE_BUILDER = \
    'full.path.to.checkout.builder.implementation.function'

DJMERCADOPAGO_CLIENT_ID = 'your-mp-client-id'
DJMERCADOPAGO_CLIENTE_SECRET = 'your-mp-secret'
DJMERCADOPAGO_SANDBOX_MODE = True
DJMERCADOPAGO_CHECKOUT_PREFERENCE_UPDATER_FUNCTION = \
    'full.path.to.checkout.builder.implementation.function'

Test project: update settings names
Test project: update settings names
