src/Routing/Route.php
public function getProcessId(): ?string
    {
        if (is_null($this->processId)) {
            return $this->parameter(ResourceRegistrar::PARAM_PROCESS_ID);
        }

        return $this->processId ?: null;
    }
public function getProcessId(): ?string
    {
        if (is_null($this->processId)) {
            return $this->parameter(ResourceRegistrar::PARAM_PROCESS_ID);
        }

        return $this->processId ?: null;
    }
Get the process id for the route.

@return string|null