Ash here from the Shopify team. Welcome to the Shopify Community!
I understand you're looking to find your Merchant ID, and I'm happy to help you out with this! The Merchant ID is not visible from the admin end, so our team will need to provide this upon request. Before we proceed, could you please reply back here and let me know:
Once I hear back, we can proceed with your request together!
I understand that you both require your Merchant ID for tax or payment purposes, and I'll be glad to provide those to you securely. I've sent each of you an email separately to the email addresses associated with your Shopify Community Accounts for authentication. Please reply back to the email you received from me, and I'll send over your Merchant ID!