It seems like new Omnipay\GoCardless\M...nt, $this->httpRequest) of type Omnipay\GoCardless\Messa...ebhookEventNotification is incompatible with the declared type Omnipay\Common\Message\ResponseInterface of property $response.
Our type inference engine has found an assignment to a property that is incompatible
with the declared type of that property.
Either this assignment is in error or the assigned type should be added
to the documentation/type hint for that property..
The expression return $this->response returns the type Omnipay\GoCardless\Messa...ebhookEventNotification which is incompatible with the return type mandated by Omnipay\Common\Message\R...stInterface::sendData() of Omnipay\Common\Message\ResponseInterface.
In the issue above, the returned value is violating the contract defined by the
mentioned interface.
Let's take a look at an example:
interfaceHasName{/** @return string */publicfunctiongetName();}className{public$name;}classUserimplementsHasName{/** @return string|Name */publicfunctiongetName(){returnnewName('foo');// This is a violation of the ``HasName`` interface// which only allows a string value to be returned.}}
Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property.
Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property..