make the package support php8

Author: darbaoui

composer.json

@@ -16,12 +16,12 @@
         }
     ],
     "require": {
-        "php": "^7.3",
+        "php": "^7.3|^8.0",
         "guzzlehttp/guzzle": "^7.0"
     },
     "require-dev": {
-        "orchestra/testbench": "^4.0",
-        "phpunit/phpunit": "^8.0"
+        "orchestra/testbench": "^4.0|^5.0|^6.0",
+        "phpunit/phpunit": "^8.0|^9.3"
     },
     "autoload": {
         "psr-4": {

database/migrations/2021_05_16_000001_create_transactions_table.php

@@ -15,7 +15,7 @@ public function up()
     {
         Schema::create('transactions', function (Blueprint $table) {
             $table->string('id')->primary();
-            $table->string('user_id');
+            $table->integer('user_id');
             $table->string('checkout_id')->unique();
             $table->string('status');
             $table->float('amount');

database/migrations/create_transactions_table.php.stub

@@ -16,7 +16,7 @@ class CreateTransactionsTable extends Migration
         Schema::create('transactions', function (Blueprint $table) {
 
             $table->string('id')->primary();
-            $table->string('user_id');
+            $table->integer('user_id');
             $table->string('checkout_id')->unique();
             $table->string('status');
             $table->float('amount');