I am from the Philippines and I am trying to set up a Shopify store for my client in the US.
Everything went perfect until the Payment portion.
I used PayTabs for our shop to received credit card payments but when I did the simulation, I'm getting the error
"Secret key doesn't matched" after I click the Confirm Payment.
Please help me.
Based on the error it sounds like the details you entered for the gateway within the Shopify Admin are not correct. I would suggest reaching out to the gateway and double checking that they key you are using is the correct one.