[Instamojo][Shopify] I am seeing this error "Invalid Authentication Header". What should I do?

Based on this error response, the reason is your Instamojo credentials which you entered in PortOne are incorrect. In your PortOne account, please head over to Payment Channels > Instamojo, Click on Manage Keys, and then click on the edit button (pencil icon in the top right). Here, re-copy and paste your Client ID, Client Secret, and Salt from your Instamojo account. Please watch this video to see where you can find these three values in your Instamojo account: https://youtu.be/DgfnnX04qZw?t=100