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Lerian SLC is the client-owned software layer that operates the Serviço de Liquidação Centralizada (SLC), Nuclea’s centralized card-settlement messaging service, on behalf of a participant. It runs inside the institution’s own regulated environment, signs with the institution’s own ICP-Brasil certificate, and speaks the official ASLC message protocol to Nuclea (ISPB 29011780) over the RSFN, Brazil’s National Financial System Network. Lerian SLC builds, signs, and transmits the ASLC settlement files, correlates Nuclea’s returns, and tracks every operation through its settlement lifecycle by its NUliquid, Nuclea’s settlement identifier. It is standalone, multi-tenant, and API- and event-first.

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What Lerian SLC does — and does not — do

  • It is standalone. Lerian SLC settles cards on its own and depends on no other Lerian product. Midaz and Reporter can consume Lerian SLC, but Lerian SLC does not depend on them.
  • The private key never leaves the client’s custody. Lerian SLC materializes the unsigned file and delegates signing to a custody backend the client controls; Lerian never signs on the client’s behalf.
  • It is multi-tenant from the ground up. One deployment serves many participants with full isolation.

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Who it serves

Lerian SLC serves the roles of the Brazilian card arrangement. A single deployment can act for one or several of them.
RoleWhat it is
Credenciadora (acquirer)Captures card transactions from merchants and submits their settlement operations.
Subcredenciadora (sub-acquirer)The sub-acquirer whose representation is obligatory under Res. BCB 150/2021.
IF DomicílioThe domicile financial institution that receives settlement notices and credits the merchant.
IF LiquidanteThe settling financial institution that funds the clearing position for a settlement cycle.
BandeiraThe card scheme of the arrangement.

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Glossary

TermMeaning
Lerian SLCLerian’s client-owned software for operating Nuclea’s centralized card-settlement (SLC) messaging.
SLC — Serviço de Liquidação CentralizadaNuclea’s centralized settlement service for the Brazilian card arrangement.
ASLCThe official Nuclea XML message layout family used by the SLC — UTF-16BE, XSD-validated.
NUliquidNuclea’s 21-position settlement identifier (an AAAAMMDD date prefix plus a sequence) that tracks each operation’s lifecycle.
ISPBThe BACEN participant identifier; Nuclea’s SLC destination is 29011780.
RSFNBrazil’s National Financial System Network, which carries SLC traffic.
ICP-BrasilThe Brazilian public-key infrastructure whose certificate signs SLC files.
SPB security envelopeThe BACEN payment-system envelope — GZIP plus an RSA/SHA-256 signature and AES-256, with a 588-byte security header — wrapping each file.
Clearing cycleThe settlement window over which Lerian SLC computes and reconciles positions for the IF Liquidante.
For how Lerian SLC sits alongside the other native rails and the provider interfaces, see Native Messaging. The card-domain deferred-net settlement family reaches Lerian SLC relayed from Lerian SILOC, the participant-side SILOC connectivity.