php - Paypal sandbox payment fails due to risk model? -


i using angelleye codeigniter paypal library direct payments. link github library https://github.com/angelleye/paypal-codeigniter

i have tried several times make payments. sometimes, card payments successful. however, of show 'transaction refused due risk model' error. have tried looking around solution , paypal says ask client choose different payment method. isn't strange don't know solution issue?

has else encountered such issue? hope can help. thank you,


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