Changes to POST /api/v1/consulting/conversations/:conversationId/human

added the new stripe_sandbox enum value to the unavailableReason response property for the response status 200

added the optional property unavailableReason to the response with the 200 status

removed the 3995.00 enum value from the purchase/amount response property for the response status 200

removed the EUR enum value from the purchase/currency response property for the response status 200

the purchase/currency response's property pattern ^[A-Z]{3}$/u was added for the status 200