Maybe it is necessary to pass the merchant_account_id as an argument to the generate function on line 41 of 'myshop/payment/views.py'.
Replace
client_token = gateway.client_token.generate()
by
client_token = gateway.client_token.generate(params={'merchant_account_id': settings.BRAINTREE_MERCHANT_ID})
Braintree Doc: https://developer.paypal.com/braintree/docs/reference/request/client-token/generate/python
Maybe it is necessary to pass the merchant_account_id as an argument to the generate function on line 41 of 'myshop/payment/views.py'.
Replace
client_token = gateway.client_token.generate()by
client_token = gateway.client_token.generate(params={'merchant_account_id': settings.BRAINTREE_MERCHANT_ID})Braintree Doc: https://developer.paypal.com/braintree/docs/reference/request/client-token/generate/python