This assumes that you're using standard auth strategies, you have set a cookie secret, and you're using a separate cookie for store and admin APIs, e.g.
authOptions: {
tokenMethod: ['cookie'],
cookieOptions: {
name: { shop: 'vendshop', admin: 'vendadmin' },
secret: 'somethingthatIwillnevertellyouandyouwillneverguessthisisntitipromisenoreally',