Undefined array key "transaction" (temporary workaround included)

Here is a related issue on Github - https://github.com/yabacon/paystack-php/issues/36

As I see on GitHub the yabacon/paystack-php library used here is unsupported and outdated. I would suggest to completely rewrite the module according to the original Paystack API - https://paystack.com/docs/api/#introduction

Wao, complete rewrite? It can't work like a drop-in replacement of the library and updating some functions?

Apparently the fix is in the "master" branch on the library's repository. In theory that should be possible to add to a project via this command:

composer require yabacon/paystack-php:dev-master

However, because this module requires v2.1 or newer, composer will likely complain that "dev-master" (i.e. the master branch) does not fulfill that requirement.

One approach would be to create a merge request here that changes the dependency to say this:

    "yabacon/paystack-php": "dev-master"

I created a merge request with the proposed change, and here's a patch for good measure.

Note: in order to use this in Composer you'll need to update your site's composer.json to use the merge request directly, instead of the patch.

This blog post explains how to use a merge request in your site's composer.json file: https://www.mediacurrent.com/blog/how-fix-catch-22-problem-drupal-9-fixe...

MR3 worked when applied following the instructions at #10.

FYI in the github issue I suggested the maintainers tag a new release, as that would solve everyone's problems, and you wouldn't need to change this module at all.

Thank you sir!