where to put acccess key and secret of unsplash using axios

fetchInitialImages = () => {this.setState({ searchedQuery: 'Curated Collection'})axios.get(`${this.ROOT}photos${this.KEY}${this.PERPAGE}&page=1`)    .then(res => {      let results = res.data      this.setState(() => {        return { gallery: [...results] }      }, () => { console.log('this.state.gallery = ', this.state.gallery)})    })    .catch(error => console.log(error))}