Notes

function getDiscountCodes() {
$args = array(
'post_type' => 'discount_code',
'posts_per_page' => -1,
);
$posts = get_posts( $args );
$data = array();
if ( ! empty( $posts ) ) {
foreach ( $posts as $post ) {
$post_id = $post->ID;
$signedin_msg = get_field('store_signedin_discount_msg', $post_id);
$nonsignedin_msg = get_field('store_nonsignedin_discount_msg', $post_id);
$data[] = [
'id' => $post_id,
'store_name' => $post->post_title,
'discount_code_messgae_for_signedin_users' => $signedin_msg,
'discount_code_message_for_non_signedin_users' => $nonsignedin_msg,
];
}
}

return rest_ensure_response( $data, 200 );
}
register_rest_route('api/v1','/discount-codes/',
array(
'methods' => 'GET',
'callback' => 'getDiscountCodes',
'permission_callback' => '__return_true',
)
);

function custom_jwt_login_callback(WP_REST_Request $request) {
$username = $request->get_param('username');
$password = $request->get_param('password');

if (empty($username) || empty($password)) {
return new WP_Error('missing_credentials', 'Missing username or password.', array('status' => 400));
}

$user = wp_authenticate($username, $password);

if (is_wp_error($user)) {
return new WP_Error('invalid_credentials', 'Invalid username or password.', array('status' => 403));
}
$jwt_public = new Jwt_Auth_Public('jwt-auth','1');
$token = $jwt_public->generate_token($request);

if (!$token) {
return new WP_Error('token_generation_failed', 'Could not generate token.', array('status' => 500));
}

return rest_ensure_response(array(
'status' => 200,
'token' => $token,
'user_id' => $user->ID,
), 200);
}

register_rest_route('api/v1', '/login', array(
'methods' => 'POST',
'callback' => 'custom_jwt_login_callback',
'permission_callback' => '__return_true',
));