We are 3 learners in dev school, for a data visualization project, realized in JavaScript. We used the Pexels API, but we encountered problems when we followed its documentation.
This one is rather light and did not work for us.
Here's how we solved our hang-ups:

• Authorization to insert the API key Pexels documentation:

import { createClient } from 'pexels';
const client = createClient('YOUR_API_KEY');

Our solution:

headers: { 
Authorization: "YOUR_API_KEY",
}

• Search for a photo by color: remove the # in front of the hexadecimal code (in lower case).

Marine, Audrey & Virginie