We are in process of creating our payments app, and would like to know below:
1. After we authenticate the merchant using oAuth we get an access token, is this access token onetime or we need to request for a refresh token. - https://shopify.dev/apps/auth/oauth
2. Do we need to pass this access token in the header while processing a payment. Couldn't find anything on this page - https://shopify.dev/apps/payments/processing-a-payment.
3. Is payment app an embedded public app or simply a public app - https://shopify.dev/apps/getting-started/app-types. This will help us whether we need to make use of session tokens for our payment app.
