I have been using the PHP API with no problems for quite a while. All of a sudden, a client informs me he can't pay. So on my site, where I have the "Pay with PayPal" button on the user-specific form, I click it and just get a blank screen instead of the expected PayPal one. It's the "getApprovalLink()" which seems to not work. Is this a PayPal site problem, or has the API been updated abruptly or something? Because nothing on my site has changed.
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