USA: There are two main postage types in US First class - 1 to 3 business days - First class mail is typically used for transactional mail purposes like invoices, bills and so on which requires quicker SLA and has higher sensitivity with regards to ...
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A simple API to send letters, postcards, and cheques. You can integrate this API to automate your transactional mailings and/or provide offline sending capabilities to your users. If you just want to perform one-off sends, you can also do so directly ...