Example app that demonstrates how Adyen, Stripe and Mollie checkout and OAuth work an all 3 platforms
https://marcsexperiment.ew.r.appspot.com
# Login in to gcloud to start using the cli
gcloud auth login
gcloud config set project <your-project-name>
# Prepare a task-queue
gcloud tasks queues create default --max-attempts=10 --max-concurrent-dispatches=5
# Create your own app.yaml
cp app_example.yaml app.yaml # and set env-vars to the right values
# Perform the actual deployment
gcloud app deploy app.yaml index.yaml cron.yaml --quiet