Tap and Pay Clarity

I'm mentioning above before starting the Tap and pay development Because its better we both understand the complexity of task.
Correct above sentence

Here is the corrected version of your sentence:

**"I'm mentioning this beforehand before starting the Tap and Pay development because it's better that we both understand the complexity of the task."**

Alternatively, a slightly more polished version:

**"I'm bringing this up before starting the Tap and Pay development so that we both have a clear understanding of the task's complexity."**