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Introduction to the eCheck Service
    The eCheck payment service enables merchants to accept electronic check payments using a
			variety of methods, including mail, telephone, and online orders.
There are two main types of eCheck transactions: 
- A charge is initiated to take money from a customer's bank account and transfer it to the merchant's bank account. Most eCheck transactions are ACH charges.
 - A credit or refund is initiated to transfer money back to the customer's bank account.