Laravel Update / install composer package - php

Question

Can you answer me?
I use the latest version of Laravel and I want to add to my project the PayPal service.
I want to install some package to Laravel and added this 2 rows to composer.json
"guzzlehttp/guzzle": "~5.2",
"paypal/rest-api-sdk-php": "*"
My composer.json file
{
"name": "laravel/laravel",
"description": "The Laravel Framework.",
"keywords": ["framework", "laravel"],
"license": "MIT",
"type": "project",
"require": {
"php": ">=7.0.0",
"fideloper/proxy": "~3.3",
"laravel/framework": "5.5.*",
"laravel/tinker": "~1.0"
},
"require-dev": {
"filp/whoops": "~2.0",
"fzaninotto/faker": "~1.4",
"mockery/mockery": "0.9.*",
"phpunit/phpunit": "~6.0"
},
"autoload": {
"classmap": [
"database/seeds",
"database/factories"
],
"psr-4": {
"App\\": "app/"
}
},
"autoload-dev": {
"psr-4": {
"Tests\\": "tests/"
}
},
"extra": {
"laravel": {
"dont-discover": [
]
}
},
"scripts": {
"post-root-package-install": [
"/usr/local/bin/php -r \"file_exists('.env') || copy('.env.example', '.env');\""
],
"post-create-project-cmd": [
"/usr/local/bin/php artisan key:generate"
],
"post-autoload-dump": [
"Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
"/usr/local/bin/php artisan package:discover"
]
},
"config": {
"preferred-install": "dist",
"sort-packages": true,
"optimize-autoloader": true,
"cache-dir": "/home/iamdevco/public_html/norrisms/designer/cache"
},
"guzzlehttp/guzzle": "~5.2",
"paypal/rest-api-sdk-php": "*"
}
but I get this error after download packages
$ composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Nothing to install or update
Generating optimized autoload files
Illuminate\Foundation\ComposerScripts::postAutoloadDump
/usr/local/bin/php artisan package:discover
The system cannot find the path specified.
Script /usr/local/bin/php artisan package:discover handling the post-autoload-dump event returned with error code 1

Answer 1

after you install all packages run
composer dumpautoload
packages
composer require guzzlehttp/guzzle-services
composer require paypal/rest-api-sdk-php
composer dumpautoload

Answer 2

Rather than manually writing the composer.json, try installing and adding them with the specific commands. Like this.
composer require paypal/rest-api-sdk-php
composer require guzzlehttp/guzzle
That way, you'll avoid any typos and composer.json file will be kept as pure as possible.

Answer 3

Try this composer require paypal/rest-api-sdk-php
Ref: https://packagist.org/packages/paypal/rest-api-sdk-php
Edit:
remove the paypal/rest-api-sdk-php on the composer.json and the guzzle then try this
composer require guzzlehttp/guzzle