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Decode content that is encrypted in an electronic digital signature.
Use Digital signature WS. Method checks digital signature and returns result.
See service specification

Validate DRFO

1. Check that DRFO in Certificate details exists and not empty
2. Check that DRFO in Certificate details is equal to DRFO in Party
   1. Get party.tax_id using employee_id in person payload
   2. Compare DRFO in Certificate with party.tax_id
      1. Convert DRFO and TAX_ID to uppercase
      2. Compare DRFO and TAX_ID as Cyrillic letters
      3. Convert DRFO to Cyrillic and compare as Cyrillic letters
   3. In case validation fails - generate 422 error

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1. Validate request using JSON schema (See specification)
   
   1. In case validation fails - generate 422 error
2. Check person request status
   1. If status is not APPROVED, - returned error 'Incorrect status'

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1. Extract legal_entity_id (client_id) from token
2. Extract employee_id from request
3. Check if $.client_id=employees.legal_entity_id 
   1. in case error return 422 

Create/update person

If person.id is in request then add mpi_id to person request. Update MPI.persons with new parameters.

If person.id is not in request then create new person in status ACTIVE or APPROVED)

Update person request status

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