The information below was delivered to one of my programmers as direction for how to implement a rather big change in an existing software product that I sell. I thought it was potentially useful to a broader audience, so I’m posting it here: …The rest of this is rather complicated to explain online. I’ll do my best. I’m going to look at this in a simplistic way and let you work through the details. First imagine that we have an Authorize.net processing class based largely on their API. class AuthnetProcessAIMPayment { protected $apiKey;......

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