unplugged_web Posted December 5, 2014 Share Posted December 5, 2014 (edited) I'm trying to set up PayPal's Express Checkout on a custom built shopping cart but I've never done anything like this before and didn't know if anybody had dine this before? I've followed PayPal's instructions but when I add the code to the page that handles the billing I just get an error saying: Direct credit card payment API call failed. Detailed Error Message: OrderTotal (Amt) : Required parameter missingShort Error Message: Missing ParameterError Code: 81100Error Severity Code: Error I tried adding the code to the page where they click to pay with PP as well as on it's own page but I get the same error both times. I know I'm doing something wrong but am not sure exactly what and would be grateful for any help please Thanks Edited December 5, 2014 by thehappyappy Link to comment Share on other sites More sharing options...
justsomeguy Posted December 5, 2014 Share Posted December 5, 2014 The error message says exactly what you're doing wrong. OrderTotal (Amt) : Required parameter missing Link to comment Share on other sites More sharing options...
unplugged_web Posted December 5, 2014 Author Share Posted December 5, 2014 There should be a value there, when I send the request to PayPal it's sent as " $paymentAmount = $_SESSION["Payment_Amount"];" and has the total amount. But after confirming the payment in PayPal it's then redirected and the value of "$paymentAmount" should be there but it's not. I'm following this: https://devtools-paypal.com/integrationwizard/ and have downloaded their code. Link to comment Share on other sites More sharing options...
justsomeguy Posted December 5, 2014 Share Posted December 5, 2014 I don't know what to tell you, the error from PayPal says that at least one value is missing. I'm not standing there watching what you're doing so there's not much else I can say. Link to comment Share on other sites More sharing options...
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