How do I access the Production APIs?

The production endpoint for Attachments Submission is:

This API supports both Solicited and Unsolicited attachments. For fax support, see the FAQ subsection
Fax Numbers and the Attachments Submissions API.

For trading partners that don't support Fax or electronic transmissions, see the FAQ subsection How do I handle payer submissions when they don't support 275 transactions and don't accept faxes?.

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