Our pricing can be seen here - https://ordermetrics.com/pricing.html
If you sign up via the OrderMetrics.com website, all billing will go through your credit card.
If you sign up via Shopify app store, the first $29 for our Lite plan is charged via Shopify. If you continue with the Pro plan, the remainder is charged via your credit card.
We recently created the startup plan for users with less than $5k revenue and it includes our pro plan features for $29 per month for the first six months. Inquire at email@example.com to learn more.