HTTPS POST - Angular 19 - Paypal HttpErrorResponse "status: 401, error: 'invalid_token',...

My snippets of code

'payment.service.ts'

endpoint_url = "https://api-m.sandbox.paypal.com/v1/oauth2/token"

autenticaService(): Observable<Object> {

const auth = `${this.client_id}:${this.client_secret}`
const data = 'grant_type=client_credentials';
let authString = "Basic " + window.btoa(auth);

return this.httpClient.post(
this.endpoint_url, data, { headers: new HttpHeaders({ 'Content-Type': 'application/x-www-form-urlencoded', 'Authorization': `${authString}` }) } ).pipe(
map(
data => {
console.log(data);
//this.storageService.setItem("Utente", username);
//this.cookieService.set("AuthToken", `Bearer ${data.token}`);
return data;
}
))
}

'shoppingcart.component.ts'

acquista = () => {
this.paymentService.autenticaService().subscribe(
body => console.log(body));
}

I receive a {"HttpErrorResponse status: 401, error: 'invalid_token', error_description: 'Token signature verification failed'} ... where i'm wrong ?? The token is what i need in this case.. but it was the request for the token.. so..

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