function onboardingCallback(authCode, sharedId) { fetch( PayPalCommerceGatewayOnboarding.endpoint, { method: 'POST', headers: { 'content-type': 'application/json' }, body: JSON.stringify( { authCode: authCode, sharedId: sharedId, nonce: PayPalCommerceGatewayOnboarding.nonce } ) } ) .then( response => response.json() ) .then( (data) => { if (data.success) { return; } alert( PayPalCommerceGatewayOnboarding.error ) } ); }