Please use the new threema.id URL actions, which work with both the regular Threema as well as the Threema Work app.
Threema supports the following URL actions:
Adding an ID to the contact list
threema://add?id=ABCDEFGH
Adds the given ID to the contact list if it's not already on it, and shows the contact details.
Composing a message
For all URLs below, a parameter “id” can optionally be added to specify the target ID. If the ID is not supplied, a contact picker will be shown first. In all cases, user confirmation (pressing the “Send” button) will be required before the message/image is actually sent.
threema://compose?text=Hello
Opens a message composer and puts the given text in the input box.
threema://compose?image=pasteboard (only on iOS)
Accepts an (unencrypted) image on the general pasteboard. A message composer is opened and a preview of the image appears. The user can then send the image by tapping the appropriate button.
threema://compose?image=pasteboard&key=0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef (only on iOS)
Allows passing encrypted image data through the general pasteboard. The image data must be encrypted with AES256 in CBC mode with PKCS7 padding and a zero IV. A new, random key should be used for each invocation.The key must be given in hex. The pasteboard type (UTI) must be “ch.threema.app.imgenc”. If the image data has been successfully decrypted, a message composer is opened and a preview of the image appears. The user can then send the image by tapping the appropriate button.
File URL handling (only on iOS)
Threema accepts the UTI “public.image”. If an image file is opened with Threema (via UIDocumentInteractionController), a contact picker is shown. Once the user has chosen a contact, the message composer is opened and a preview of the image appears. The user can then send the image by tapping the appropriate button.
