It is possible to generate the combined order for both provider’s Numbers in on EN Order.
Currently the issue is after generating the orders on Api the script is finalize the order on EN script. And if one order of API is failed then we have to rollback the entire order lot of numbers.
And for separate order process it is good but as i explained above we have to put a limitation of vendor selection on reservation. If user already selected a number from a one api then it can Not search/reserve numbers from another API. If it makes sense then let me know.