Google Streetview image is not appearing on Popup

[jeffbetts]

I'm only seeing an image placeholder instead of the Google Streetview image below the store details. The URL being created is: https://maps.googleapis.com/maps/api/streetview?size=350x120&location=51.5125168,-0.1428115&key=(My-API-KEY)&solution_channel=GMP_codelabs_simplestorelocator_v1_a
(I removed my API Key above, it's showing in the actual URL)

I thought it was an error in my working code, but after completing the exercises and uploading the code from GitHub, the images still are not appearing below the details. I'm getting a 403 status when this URL is being loaded.

[toppyc4]

you have to enable Street View Static API on your google map console