Suggest an alternative to

sdk-php

PHP SDK for Authorize.Net API

Why do you think that https://github.com/amazon-php/sp-api-sdk is a good alternative to sdk-php

A URL to the alternative repo (e.g. GitHub, GitLab)

Here you can share your experience with the project you are suggesting or its comparison with sdk-php. Optional.

A valid email to send you a verification link when necessary or log in.