The SendLetter() method is the simplest way to send a letter through the PostalMethods service. The SendLetterAndAddress() method is the simplest way to send a letter through the PostalMethods service. The GetLetterStatus() method is the simplest way to get a status report of a single letter sent through the PostalMethods service. The GetLetterStatus_Multiple() method is a way to get a status report of multiple letters - in a single Web Service request. The GetLetterStatus_Range() method is a way to get a status report of multiple letters - by ID range - in a single Web Service request. The GetLetterDetails() method is a way to get a detailed report regarding a letter. The GetPDF() method is a way to get the PDF file used for printing the letter as a binary file. The CancelDelivery() method is a way to cancel fulfillment of a letter still not delivered to the postal service. Cancellation may take up to a few minutes to succeed. If funds were deducted from the account, they will be refunded immediately. The SendLetter() method is the simplest way to send a letter through the PostalMethods service. The SendLetterAndAddress() method is the simplest way to send a letter through the PostalMethods service. The GetLetterStatus() method is the simplest way to get a status report of a single letter sent through the PostalMethods service. The GetLetterStatus_Multiple() method is a way to get a status report of multiple letters - in a single Web Service request. The GetLetterStatus_Range() method is a way to get a status report of multiple letters - by ID range - in a single Web Service request. The GetLetterDetails() method is a way to get a detailed report regarding a letter. The GetPDF() method is a way to get the PDF file used for printing the letter as a binary file. The CancelDelivery() method is a way to cancel fulfillment of a letter still not delivered to the postal service. Cancellation may take up to a few minutes to succeed. If funds were deducted from the account, they will be refunded immediately. The SendLetter() method is the simplest way to send a letter through the PostalMethods service. The SendLetterAndAddress() method is the simplest way to send a letter through the PostalMethods service. The GetLetterStatus() method is the simplest way to get a status report of a single letter sent through the PostalMethods service. The GetLetterStatus_Multiple() method is a way to get a status report of multiple letters - in a single Web Service request. The GetLetterStatus_Range() method is a way to get a status report of multiple letters - by ID range - in a single Web Service request. The GetLetterDetails() method is a way to get a detailed report regarding a letter. The GetPDF() method is a way to get the PDF file used for printing the letter as a binary file. The CancelDelivery() method is a way to cancel fulfillment of a letter still not delivered to the postal service. Cancellation may take up to a few minutes to succeed. If funds were deducted from the account, they will be refunded immediately.