Merge pull request #21 from aliqasemi/master

fix issues

update workflow

Merge pull request #18 from omalizadeh/feature/update-workflow

update workflow

Merge pull request #16 from omalizadeh/api_error_nullability

chore: make errors and errorMessage nullable in ApiError.php

Merge pull request #15 from omalizadeh/develop

Fix for nullable messages

Implemented Responsable

Added sum to helper

Add method to response with only next key

added stub methods return types