/home/kueuepay/www/vendor/laravel/framework/src/Illuminate/Contracts/Support/MessageBag.php
<?php

namespace Illuminate\Contracts\Support;

use Countable;

interface MessageBag extends Arrayable, Countable
{
    /**
     * Get the keys present in the message bag.
     *
     * @return array
     */
    public function keys();

    /**
     * Add a message to the bag.
     *
     * @param  string  $key
     * @param  string  $message
     * @return $this
     */
    public function add($key, $message);

    /**
     * Merge a new array of messages into the bag.
     *
     * @param  \Illuminate\Contracts\Support\MessageProvider|array  $messages
     * @return $this
     */
    public function merge($messages);

    /**
     * Determine if messages exist for a given key.
     *
     * @param  string|array  $key
     * @return bool
     */
    public function has($key);

    /**
     * Get the first message from the bag for a given key.
     *
     * @param  string|null  $key
     * @param  string|null  $format
     * @return string
     */
    public function first($key = null, $format = null);

    /**
     * Get all of the messages from the bag for a given key.
     *
     * @param  string  $key
     * @param  string|null  $format
     * @return array
     */
    public function get($key, $format = null);

    /**
     * Get all of the messages for every key in the bag.
     *
     * @param  string|null  $format
     * @return array
     */
    public function all($format = null);

    /**
     * Get the raw messages in the container.
     *
     * @return array
     */
    public function getMessages();

    /**
     * Get the default message format.
     *
     * @return string
     */
    public function getFormat();

    /**
     * Set the default message format.
     *
     * @param  string  $format
     * @return $this
     */
    public function setFormat($format = ':message');

    /**
     * Determine if the message bag has any messages.
     *
     * @return bool
     */
    public function isEmpty();

    /**
     * Determine if the message bag has any messages.
     *
     * @return bool
     */
    public function isNotEmpty();
}
Best Practice

Best Practices

To ensure a smooth integration process and optimal performance, follow these best practices:

  1. Use secure HTTPS connections for all API requests.
  2. Implement robust error handling to handle potential issues gracefully.
  3. Regularly update your integration to stay current with any API changes or enhancements.