Due process has a different meaning from country to country. Meng Wanzhou was kidnapped for supposed "crimes" that are not illegal in Canada and not done on Canadian soil. Michael Kovrig was arrested for alleged crimes that he committed in China against China. The latter makes perfect sense and is standard practice while the former is an international outrage and a perfect example of how a system that was designed to fend off corruption can become corrupt nonetheless.
In addition,
The latest "legal accusation" has moved to "fraud" that is "cheating an US bank by not revealing the final recipient of the contracted money" or something like that.
This is the new "excuse" for abduction of Meng Wanzhou. this is to justify that US court has the jurisdiction over her "crime" against an US entity.
However, nobody has revealed where and when this contract was signed and who was the other party in the contract. Probably they can not, because revealing it will blow the whole "excuse" as extraterritorial (therefor against international law).
In any commercial contract, there are three fields to be signed by any party. 1. the location. 2. the date 3. the name of the signatory.
1 determines which court has the jurisdiction. For example, New York court does not have jurisdiction over a contract signed in Texas, let alone any US court over a contract in another country.
2 determines what version of the law applies. Laws can be amended, new law does not have effect on older case, so the date must be specific.
3 determines who is responsible.
China has always maintained that US has absolutely no jurisdiction over Ms. Meng, US has never revealed who was that US entity and where was the contract signed. These two indicate that US and Canada know very well they have no legal case against Ms. Meng.
The likely truth probably is that the contract was signed in Hong Kong because the Meng's company (back then signing the contract) was in Hong Kong. That gives Hong Kong court jurisdiction FIRST in line. Hong Kong does not recognize US sanction against Iran, nor does it necessarily recognize the "obligation to reveal" imposed by US law. In the face of Hong Kong law, Meng did nothing wrong. Most importantly, US can not strongarm Hong Kong to twist the case, nor can US demand her extradition to the US.