Stripe has recently been implemented in 7.1. However, for some mysterious and completely ridiculous reason they have not implemented this for both Modern and Boxes order forms. Seeing as this was no problem with my previous, third party modules for Stripe, I would not expect this to be an issue for the people at WHMCS to code. Some of us rely on these order forms.
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Thanks for taking the time to submit this suggestion. At present our policy is to implement new features on the Standard Cart order form template (and its children), therefore new functionality such as Stripe is not added the legacy order form templates such as Modern or Boxes.