Sveltekit not able to retrieve URL query params

I've got a page (routes/customers/+page.svelte) in which I've got two buttons:

<div class="float-right block p-5"><button on:click={() => addNewCustomer("individual")} class="btn btn-sm bg-primary btn-outline">+ Individual</button></div><div class="float-right block p-5"><a href="#" on:click={() => addNewCustomer("business")} class="btn btn-sm bg-primary btn-outline">+ Business</a></div>

As you can see these buttons invoke addNewCustomer:

const addNewCustomer = customerType => {    goto(`/customers/tmp&type=${customerType}`)}

I also have customers/tmp/+page.svelte, and in the same location I've got +page.js.

In +page.js I just want to capture type passed in the URL:

import { page } from '$app/stores';export async function load({params}) {    const tmp = $page.url.searchParams.get('type');    console.log(params)    console.log(tmp)}

but this doesn't seem to work. I'm getting and error:

404Not found: /customers/tmp&type=businessError: Not found: /customers/tmp&type=business    at resolve (file:///ifflin-ui/node_modules/@sveltejs/kit/src/runtime/server/index.js:322:13)    at Object.handle (file:///flin-ui/node_modules/@sveltejs/kit/src/exports/vite/dev/index.js:318:66)    at respond (file:///ifflin-ui/node_modules/@sveltejs/kit/src/runtime/server/index.js:341:30)    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)    at async file:///ifflin-ui/node_modules/@sveltejs/kit/src/exports/vite/dev/index.js:376:22

If I get rid of the query in the url (/customers/tmp) my page loads correctly.What am I missing?

Update

As it was mentioned I should be using /customers/tmp?type=${customerType} instead of /customers/tmp&type=${customerType} (notice the use of ? instead of &, don't know how I missed that detail) yet after updating I still get the following error:

500Cannot read properties of undefined (reading 'get')TypeError: Cannot read properties of undefined (reading 'get')    at load (/src/routes/customers/tmp/+page.js:4:26)    at load_data (file:///Users/hansgruber/Desktop/webdev/projects/dundermifflin-ui/node_modules/@sveltejs/kit/src/runtime/server/page/load_data.js:109:38)    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)    at async file:///Users/hansgruber/Desktop/webdev/projects/dundermifflin-ui/node_modules/@sveltejs/kit/src/runtime/server/page/index.js:203:13

seems to be related to get:const tmp = page.url.get('type');I've tried the following as wellconst tmp2 = page.url.searchParams.get('type');but still getting an error