Create Requisition using Rest API submitting for approval and accounting

Summary:

I am looking to use the rest API in OIC and wanted to use the create purchase requisition process and then derive the charge account and submit it for approval. The only way that I can achieve this rather than creating the requisition and then calling the API again to complete the other steps. Is there a way to achieve this without calling the API 3 times.

Content (please ensure you mask any confidential information):

Whilst it works well in OIC where I was testing the integration in theory a step could fail leaving us with requisitions not submitted for approval or with incorrect accounting. The reason for asking this is that a third party will be using the REST API to generate the requisitions and it would be better if this was just one call.