I have since raising this issue - have had the issue resolved. I have made no changes to my website - both ZenCart and WooCommerce platforms at all. The only changes I made - which I am positive would not have made a difference, is re-initialise the API's signatures etc for PayPal. The old ones were running since 2010, and without any issues at all. However PayPal suggested that I try and re-initialise and this may resolve. Upon re-initialising and making the changes to WooCommerce and ZenCart - PayPal - modules - it continued to do the same. Some hours later - it was all resolved, without me making any changes. I had placed a call with the PayPal MTS team, and they tested it for me, and reported back that they could not see the issue at all. Since then it has been working.
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We have been using the PayPal Express Checkout module on our ZenCart Shopping cart for years. Only till today we noticed that payments were failing to come thorugh and customers - were contacting us. The error they receive when performing the checkout at the ZenCart - is as follows: An error occurred when we tried to contact the payment processor. Please try again, select an alternate payment method, or contact the store owner for assistance. () - (28) Operation timed out after 10002 milliseconds with 0 out of 0 bytes received Contacted PayPal - who suggested that we re-initialise the APIs - which we did - and it made no difference Any assistance - would be greatly appreciated.
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