With upcoming Legislation in EU, many Countries will mandate Electronic Invoicing Formats (supplementing, or replacing PDF) when issuing electronic Invoices.

In order to facilitate this, I'm proposing that Blesta adds the option of "user defined" invoice-formats.

Proposed Function:

- Folder Holding "Invoice-Formats" (Each invoice template is a .template File extension (Type: UTF8-Textfile). For each invoice template there is a config.json specifying "display name",.....)

- Admin Interface: Show a list of "Invoice-Templates" similar to how it works for "plugins". With options to enable/disable. (And If invoices rendered via this should be cached).

- Client Interface: When selecting the "View Invoice"/"Download Invoice" Drop Down -> Show entries/option for every one of the enabled Invoice Formats.

-Backends: Simple Templating Logic. (Invoice data + Template format == render Digital Invoice)

Reasoning behind this suggested implementation:

Many countries will have very different preferred electronic invoice formats. In the future formats may also change. And even if one country/region allows multiple formats, there will also be different revision, internal preferences,.... The suggested solution takes all of this into account, with blesta providing the facilities, and users being able to provide the format definitions.

Reference Implementation/format:

- Here i would suggest "UBL XML" format. As it appears to be one of the most widely accepted.