Taxumo has been working closely with the BIR since April 2016. According to the bureau, they do not have an accreditation/certification that they can provide to entities such as us - Taxumo was the very first entity they encountered who wanted to do something like this.
Once that changes though, we’re sure to be first in line to get that. :)
Related question: Is Taxumo a direct arm of the BIR or is it a private entity?
Taxumo is a private Filipino entity incorporated in the Philippines and headquartered in Taguig.