I can't create a payment extension by following steps from Shopify documentation, all of these steps don't exist at the partner's dashboard.
I followed this link https://shopify.dev/apps/payments/creating-a-payments-app.
what should I do?
You need to be approved to become Shopify Payment Partner before start to create the payment app. After you would be Shopify Payment Partner, you will be granted the permission to access the Shopify payment platform. https://shopify.dev/apps/payments#payments-partner-application-review
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