How to set header to all my api calls while testing front end with cypress?

Hello i am a newbie with cypress and i feel blocked ,However i tried to slove the problem this is my test block, in my case after paying confirming an order i should be redirected to another page that , but i always get 401 Unauthorized status because i need the token. the problem is that i can't set the token in header of back-end api ?

it("Confirm order on the spot", () => {
   cy.Authentification();
   cy.server({
     onAnyRequest: (route,  proxy) => {
       proxy.xhr.setRequestHeader('Authorization',  cy.getLocalStorage('token'))
     }
   }); 
   cy.route({
     method: "POST",
     url: "/api/*", 
   });
   cy.get("#basket-button").click();
   cy.get("#confirm-order").click();
   cy.url().should("include", "/payment/method");
   cy.get("#pay-on-spot").click();
   cy.url().should("include", "/payment");
   cy.get('input[placeholder="Entrez votre numéro de téléphone"]').type(
     "0753949566"
   );
   cy.get('div[data-text-as-pseudo-element="Confirmer"]').parent().click();
 });