Create a lead and qualify it to an opportunity in Dynamics 365 Sales via the Web API

Steps

1. Create the lead record by POSTing to https://<org>.crm.dynamics.com/api/data/v9.2/leads with a JSON body containing required fields: lastname, subject, and optional fields like emailaddress1, telephone1, and companyname.
2. Capture the new lead's GUID from the OData-EntityId response header (HTTP 204) or from the response body if you used Prefer: return=representation.
3. Qualify the lead by invoking the QualifyLead unbound action: POST https://<org>.crm.dynamics.com/api/data/v9.2/QualifyLead with body specifying LeadId (OData bind reference to the lead), Status (integer: 3 for Qualified), CreateAccount, CreateContact, and CreateOpportunity as Boolean parameters.
4. Parse the QualifyLead response to extract the CreatedEntities array, which contains OData references to the newly created Account, Contact, and/or Opportunity records.
5. Open the created Opportunity record to populate additional fields (estimated revenue, close date, description) via PATCH https://<org>.crm.dynamics.com/api/data/v9.2/opportunities(<opportunityId>).
6. Add opportunity line items (opportunityproducts) linked to the opportunity via POST to /api/data/v9.2/opportunityproducts with opportunityid@odata.bind referencing the opportunity.