Need Urgent Shopify Payment Gateway Issue Resolution

We are facing a payment gateway issue on our Shopify store (House of Varada). When a customer clicks “Pay Now” during checkout, the following error appears:

“There was an issue processing your payment. Try again or use a different payment method.” I can share the recording as well.

Shopify support reviewed the logs and confirmed that Instamojo is returning a 401 authentication error, indicating an authorization failure between Shopify and Instamojo.

Instamojo support has stated that our account is active, but the problem persists. Additionally, our Portone login shows:

“Login has been disabled for Merchant by the Master Merchant.”

We need an expert to:

Diagnose and fix the Instamojo → Portone → Shopify connection issue
Verify and correct API credentials / integration settings
Restore successful payment processing
Test and confirm transactions end-to-end

Required experience:

Shopify payment gateway integrations

Instamojo

Portone or similar payment API debugging

Authentication / authorization / server error handling

This is urgent and needs immediate attention.