src/Api/Usage.php
public function setRequirements($var)
    {
        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::STRING);
        $this->requirements = $arr;

        return $this;
    }
public function setRequirements($var)
    {
        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::STRING);
        $this->requirements = $arr;

        return $this;
    }
Requirements that must be satisfied before a consumer project can use the
service. Each requirement is of the form <service.name>/<requirement-id>;
for example 'serviceusage.googleapis.com/billing-enabled'.

Generated from protobuf field <code>repeated string requirements = 1;</code>
@param string[]|\Google\Protobuf\Internal\RepeatedField $var
@return $this