PayPal\Auth\PPSignatureCredential::getSignature PHP Method

    public function getSignature()
    {
        return $this->signature;
    }

 /**
  * @test
  */
 public function testGetSignature()
 {
     $this->assertEquals('Abg0gYcQyxQvnf2HDJkKtA-p6pqhA1k-KTYE0Gcy1diujFio4io5Vqjf', $this->merchantCredential->getSignature());
 }