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Bank Accounts4

Boxes5

Bulk Verification3

Campaigns6

Cheques8

Contacts4

Events1

International API4

Letters7

Mailing List Imports5

Mailing Lists6

Postcards7

Reports10

Return Envelopes8

Self Mailers6

Snap Packs6

Standard API9

Sub-Organizations4

Targeted List Builds7

Template Editor Sessions3

Templates5

Trackers6

Virtual Mailboxes7

Webhooks6

Letters

Changes to Get Letter Preview

get/print-mail/v1/letters/{id}/url

May 1, 2026c8fedcbd705e Revision changes
- warning
  added the new internal_server_error enum value to the / response property for the response status
- warning
  added the new not_found_error enum value to the / response property for the response status
- warning
  added the new rate_limit_exceeded_error enum value to the / response property for the response status
- info
  added subschema #1 subschema #2 to the response body anyOf list for the response status
- info
  removed subschema #1 subschema #2 from the response body anyOf list for the response status