How to create and Retrieve(get) customer account and sites using rest api/soap services

Summary:

How to create and Retrieve(get) customer account and sites using rest api/soap services

Specifically, we are looking for the following functionalities:

1. Ability to create customer accounts and retrieve their account details

2. Ability to create customer account sites and retrieve site and site usage details

- Retrieving account numbers based on the email address associated with its contact(s) (xxxx@hh.com)

- Looking up site numbers for sites

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