How to populate flexfields/attachments when Creating Requisition using Rest Web Service

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Hi all, please, is it possible to populate flexfields and attachments when creating requisitions using rest webservices ?

I couldn't find the flexfields attributes and attachments field on the rest web service body/payload but i do see it on the soap web service body, i would like to confirm/double-check if it's the only way

Rest Web service : https://docs.oracle.com/en/cloud/saas/procurement/19d/fapra/op-purchaserequisitions-requisitionheaderid-child-lines-post.html

Soap WS: https://docs.oracle.com/en/cloud/saas/procurement/19d/oeswp/business-object-services.html#purchaserequestcreaterequisitionconfigurationdetai-d17112e41225

kind rgds