I'm using paypal/PayPal-PHP-SDK: PHP SDK for PayPal RESTful APIs (github.com) for payment checkout and subscription.
Sandbox is working fine.
But when turn to live. Both checkout and subscription failed.
When I click checkout, below error will be shown:
We couldn't complete your payment for you. To get your payments working again, check your account or contact us
When I click check out below error will be shown:

please help!