I"m getting: “There was an issue processing your payment. Try again or use a different payment method.” when testing Paynow in the Shopify app at checkout. Iam still in testing mode. I followed the instructions here: https://apps.shopify.com/paynow-zw 4 and double checked the Integration ID and Key and nothing is working.
My shopify store link: https://bluepulsezim.myshopify.com/
I entered the integration key and id, toggled on test mode followed instructions in the video but the error persists

