I have sales channel app, i am able to create checkouts, and update checkouts with shipping rates etc. in checkout object i am getting shopify_payments_account_id null. I need to create payment through stripe https://help.shopify.com/en/api/guides/sales-channel-sdk/completing-a-payment#integrate-stripe-with-...
Store that im testing my app with have shopify payments enabled
It looks like there are some steps you're missing in order to be able to integrate Stripe with your Sales Channel.
As mentioned here, you must first Request payment processing via your App Setup screen in your Partner's Dashboard. Once you have done that, our Partner Specialists will review your application to ensure you meet all the criteria before enabling you to process payments with Stripe