You can see changes in the commits to find out how to easy implement ecommpay payment methods on the frontend
Ecommpay extension repository for commercetools
Sunrise CommerceTools demo data
You need to install the dependencies with yarn install --frozen-lockfile, then you can start the project with yarn start.
If you want to use the default merchant center project there is no need to add a .env file, if you want to connect to your own merchant center project you need to set this up
yarn start