create subscription <br><form method=post action=subscription_create.php>amount <input type=text name=amount value=''><br><input type=submit name=submit value=submit></form>update subscription <br><form method=post action=subscription_update.php>subscription id<input type=text name=subscriptionId value=''><br><input type=submit name=submit value=submit></form>cancel subscription<br><form method=post action=subscription_cancel.php>subscription id<input type=text name=subscriptionId value=''><br><input type=submit name=submit value=submit></form>