Paypal configuration not working

I have tried to configure paypal both as a smart button and standard. I have all of the information added from paypal. When going through checkout as a customer, i get to the part where you are supposed to be directed to paypal and this is what I am getting
'Things don't appear to be working at the moment. Please try again later."

What version of nopCommerce are you using?
You may have an issue with Currency settings.  See this topic
https://www.nopcommerce.com/en/boards/topic/47030/issue-with-paypal-standard-plugin

asantas wrote:
Hi... take a look at that
Configuring PayPal Smart Payment Buttons plugin in nopCommerce https://www.youtube.com/watch?v=lJxVqjwUFkY&feature=youtu.be

ERROR:

Log level
Error
Short message
Payments.PayPalSmartPaymentButtons error:
One or more errors occurred. ({"error":"invalid_client","error_description":"Client Authentication failed"})
Full message
System.AggregateException: One or more errors occurred. ({"error":"invalid_client","error_description":"Client Authentication failed"})
---> PayPalHttp.HttpException: {"error":"invalid_client","error_description":"Client Authentication failed"}
   at PayPalHttp.HttpClient.Execute[T](T req)
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
   at Nop.Plugin.Payments.PayPalSmartPaymentButtons.Services.ServiceManager.HandleCheckoutRequest[TRequest,TResult](PayPalSmartPaymentButtonsSettings settings, TRequest request)
   at Nop.Plugin.Payments.PayPalSmartPaymentButtons.Services.ServiceManager.<>c__DisplayClass28_0.<GetAccessToken>b__0()
   at Nop.Plugin.Payments.PayPalSmartPaymentButtons.Services.ServiceManager.HandleFunction[TResult](PayPalSmartPaymentButtonsSettings settings, Func`1 function)

asantas wrote:
On the PayPal plugin config page, do you have "Use sandbox" selected?  Try unselecting that.