If you have difficulties upgrading, please create an issue.
If you save invoices
to your app you should add a migration with:
$tableName = config('harvest.table_prefix').config('harvest.table_names.invoices');
Schema::create($tableName, function (Blueprint $table) {
$table->string('state');
});
Because v2 is a complete rewrite a simple upgrade path is not available. If you want to upgrade completely remove the v1 package and follow install instructions of v2.