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I have in my shop Opencart the module of the transparent checkout pagseguro I noticed that on rare occasions a customer could not make the payment by credit card. Today a customer came to the store and happened again just when I apply any discount ( in the sale value and not in the product ) he plays the following mistake
installment value invalid value: 247.82
after some research I saw that it is probably because the error of the value of the plots does not match the value of the products.
Is there any way to inform pagseguro of the discount applied or any way to resolve this error?
How does Voce make the call? use the same or done api? they recommend using extraAmount with negative value:
Parâmetro HTTP:
extraAmount 

Elemento XML:
<checkout>
<extraAmount>https://pagseguro.uol.com.br/v2/guia-de-integracao/api-de-pagamentos.html– Daniel Costa