Convert part of PHP API code for writing a new document into a Firestore collection into a transaction (used in Google Cloud Function):

@arityinfoway

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@subratawsk

START NOW Hi There, Hope you are doing well. Thanks for the requirement. We have gone through your description and we are confident to deliver you best solution. Your Goal of the project and your requirement is very clear to us. Looking forward to hear back from you and maintain a long term relationship. Cheers! Subrata R.

@InstaaCodersUS

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