/home/kueuepay/public_html/vendor/guzzlehttp/psr7/src/PumpStream.php
<?php

declare(strict_types=1);

namespace GuzzleHttp\Psr7;

use Psr\Http\Message\StreamInterface;

/**
 * Provides a read only stream that pumps data from a PHP callable.
 *
 * When invoking the provided callable, the PumpStream will pass the amount of
 * data requested to read to the callable. The callable can choose to ignore
 * this value and return fewer or more bytes than requested. Any extra data
 * returned by the provided callable is buffered internally until drained using
 * the read() function of the PumpStream. The provided callable MUST return
 * false when there is no more data to read.
 */
final class PumpStream implements StreamInterface
{
    /** @var callable(int): (string|false|null)|null */
    private $source;

    /** @var int|null */
    private $size;

    /** @var int */
    private $tellPos = 0;

    /** @var array */
    private $metadata;

    /** @var BufferStream */
    private $buffer;

    /**
     * @param callable(int): (string|false|null)  $source  Source of the stream data. The callable MAY
     *                                                     accept an integer argument used to control the
     *                                                     amount of data to return. The callable MUST
     *                                                     return a string when called, or false|null on error
     *                                                     or EOF.
     * @param array{size?: int, metadata?: array} $options Stream options:
     *                                                     - metadata: Hash of metadata to use with stream.
     *                                                     - size: Size of the stream, if known.
     */
    public function __construct(callable $source, array $options = [])
    {
        $this->source = $source;
        $this->size = $options['size'] ?? null;
        $this->metadata = $options['metadata'] ?? [];
        $this->buffer = new BufferStream();
    }

    public function __toString(): string
    {
        try {
            return Utils::copyToString($this);
        } catch (\Throwable $e) {
            if (\PHP_VERSION_ID >= 70400) {
                throw $e;
            }
            trigger_error(sprintf('%s::__toString exception: %s', self::class, (string) $e), E_USER_ERROR);

            return '';
        }
    }

    public function close(): void
    {
        $this->detach();
    }

    public function detach()
    {
        $this->tellPos = 0;
        $this->source = null;

        return null;
    }

    public function getSize(): ?int
    {
        return $this->size;
    }

    public function tell(): int
    {
        return $this->tellPos;
    }

    public function eof(): bool
    {
        return $this->source === null;
    }

    public function isSeekable(): bool
    {
        return false;
    }

    public function rewind(): void
    {
        $this->seek(0);
    }

    public function seek($offset, $whence = SEEK_SET): void
    {
        throw new \RuntimeException('Cannot seek a PumpStream');
    }

    public function isWritable(): bool
    {
        return false;
    }

    public function write($string): int
    {
        throw new \RuntimeException('Cannot write to a PumpStream');
    }

    public function isReadable(): bool
    {
        return true;
    }

    public function read($length): string
    {
        $data = $this->buffer->read($length);
        $readLen = strlen($data);
        $this->tellPos += $readLen;
        $remaining = $length - $readLen;

        if ($remaining) {
            $this->pump($remaining);
            $data .= $this->buffer->read($remaining);
            $this->tellPos += strlen($data) - $readLen;
        }

        return $data;
    }

    public function getContents(): string
    {
        $result = '';
        while (!$this->eof()) {
            $result .= $this->read(1000000);
        }

        return $result;
    }

    /**
     * @return mixed
     */
    public function getMetadata($key = null)
    {
        if (!$key) {
            return $this->metadata;
        }

        return $this->metadata[$key] ?? null;
    }

    private function pump(int $length): void
    {
        if ($this->source !== null) {
            do {
                $data = ($this->source)($length);
                if ($data === false || $data === null) {
                    $this->source = null;

                    return;
                }
                $this->buffer->write($data);
                $length -= strlen($data);
            } while ($length > 0);
        }
    }
}
Path: home/kueuepay/public_html/vendor/guzzlehttp/psr7/src
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Kueue Pay Payment Gateway Solutions Developer API Documentation

Welcome to the Kueue Pay Payment Gateway Solutions Developer API Documentation. This comprehensive guide will empower you to seamlessly integrate our advanced payment gateway into your website, enhancing your customers’ payment experience and enabling efficient transaction processing. The Kueue Pay Developer API is designed for developers and entrepreneurs who seek simplicity, security, and reliability in their payment processing solutions.

1. Introduction

The Kueue Pay Developer API allows you to seamlessly integrate Kueue Pay’s Payment Gateway Solutions into your website, enabling secure and efficient debit and credit card transactions. With our API, you can initiate payments, check payment statuses, and even process refunds, all while ensuring a smooth and streamlined payment experience for your customers.

Prerequisites