The letter APi is an application programming interface. It can be used to send letters, receive faxes, and store documents. It can be accessed by both API consumers and developers. To use this API, you must be using PHP or Python. The API consumer must upload the required files and associated them with the referral letter. It must include at least one attachment. Once the files are uploaded, the API consumer must post them to the referral.
Using a letter API can be difficult, but there are steps you can take to ensure your privacy. Check the letter API's CASS certification. This service will check the addresses against a database maintained by the USPS. It also uses a postal database of 190 countries. You can find your API keys in the dashboard. HTTP basic authentication protects your data. You can set multiple users to access the dashboard and change permission levels.
MailWriter has a lot of features to offer. You can upload PDFs, address information, and other relevant information. Then, the software will handle the rest. This service also allows you to send mails without folding or inserting them yourself. MailWriter also offers customised postcards. Upload a photo, choose a design, and choose whether you want to print full-colour or monochrome. MailWriter also allows you to set a custom logo for your letters and other materials.
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