Ash here from the Shopify team. Thank you for your question!
I'm happy to help out with getting you your Shopify Payments Account ID. In order to do so, I'll just need to authenticate you on the shop in question. I've sent an email to the email address associated with your Shopify Community account with the next steps. Please reply to that email and provide the information requested within it, and once I hear back we can move forward with your request. Looking forward to hearing back!
Thank you for getting back to me. While here on the Shopify Community Forums, if you click on your username next to your post, you'll be brought to your profile. This is where you can see the email address associated with your Community account, and that's the one I used to contact you.
With that said, I did manage to find an email reply you sent, and I will reply to you back in there so we can continue to work through this together.