I'm trying to use Paypal API SDK in PHP. For a normal transaction, I can set a `Payee` like this : $payee = new \PayPal\Api\Payee();
$payee->setEmail("client-test_at_xxx.com"); And then : $transaction = new \PayPal\Api\Transaction();
$transaction->setAmount($amount)
->setPayee($payee); How can do the same with a billing plan?
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