It is not just the customization. We need to completely change the UI, incorporate your social media plug-ins, change the payment gateway, SMS gateway, etc.
Please review the sentence.
My response in (US) English: What you wrote looks great. I added some optional words. It is not just the customization that needs to be addressed .
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
My response in (US) English:
What you wrote looks great. I added some optional words.
It is not just the customization that needs to be addressed. We need to completely change the UI, incorporate your social media plug-ins, change the payment gateway, SMS gateway, etc.
You could delete "the," but it's not a mistake to have it in the sentence. I think I would delete it.