That's is exactly how I used it too: develop locally, but expose it to a payment...

mcv on May 6, 2017 | parent | context | favorite | on: Ngrok: Secure tunnels to localhost

That's is exactly how I used it too: develop locally, but expose it to a payment provider's webhook call through ngrok. It's very convenient, and has the added advantage that you can replay the webhook call without going through the entire process at the payment provider.