Tier codes are used for calculating the Merchant Discount Rate (MDR). Refer to the table below for a list of codes and their descriptions. The codes in this table are listed in alphabetical order. These tier codes appear in the Find a Transaction module.
| Tier code | Description |
| B2B2 | Business data level 2 |
| CNCT | Consumer contactless |
| CNEL | Consumer electronic |
| CNFE | Consumer foreign electronic |
| CNFS | Consumer foreign standard |
| CNHC | Consumer high spend contactless |
| CNPC | Consumer premium contactless |
| CNST | Consumer standard |
| CODA | Commercial data |
| COD1 | Commercial data 1 |
| COEL | Corporate electronic |
| COFE | Corporate foreign electronic |
| COFS | Corporate foreign standard |
| COLT | Commercial large ticket |
| COST | Corporate standard |
| CWEE | Consumer premium plus electronic |
| CWEM | Consumer premium plus emerging |
| CWEP | Consumer premium plus |
| CWES | Consumer premium plus standard |
| DBEL | Debit electronic |
| DBF1 | Low ticket Flash tier 1 |
| DBF2 | High volume Flash tier 2 |
| DBF3 | Standard Flash tier 3 |
| DBIN | Debit industry |
| DBMP | Debit consumer Paypass |
| DBNF | Standard transaction |
| DBPR | Debit performance |
| DBRC | Debit recurring |
| DBSS | Debit standard secure eCommerce |
| DBST | Debit standard |
| ELEC | Tarification fixe |
| EMCN | Consumer emerging |
| EMCO | Corporate emerging |
| EMCW | Consumer high spend emerging |
| EMDB | Debit emerging |
| EMPR | Consumer premium emerging |
| FPEL | Foreign premium electronic |
| FPST | Foreign premium standard |
| INAP | INAP - eCommerce |
| INCO | Corporate industry |
| INDS | Consumer industry |
| INPR | Consumer premium industry |
| INWE | Consumer premium plus industry |
| MANO | Not found |
| NOEL | ChainMainReportsHelpE |
| PECO | Corporate performance |
| PERF | Consumer performance |
| PREL | Consumer premium electronic |
| PRPF | Consumer premium performance |
| PRST | Consumer premium standard |
| RECO | Corporate recurring |
| RECR | Consumer recurring |
| REPR | Consumer premium recurring |
| REWE | Consumer premium plus recurring |
| 2D01 | Qualified debit |
| 2D02 | Non-qualified debit |
| 2Q01 | Qualified credit |
| 2Q02 | Non-qualified credit |
| 3D01 | Qualified debit |
| 3D02 | Mid-qualified debit |
| 3D03 | Non-qualified debit |
| 3Q01 | Qualified credit |
| 3Q02 | Mid-qualified credit |
| 3Q03 | Non-qualified credit |
| 5D01 | Qualified debit |
| 5D02 | Near-qualified debit |
| 5D03 | Mid-qualified debit |
| 5D04 | Near-mid-qualified debit |
| 5D05 | Non-qualified debit |
| 5Q01 | Qualified credit |
| 5Q02 | Near-qualified credit |
| 5Q03 | Mid-qualified credit |
| 5Q04 | Near-mid-qualified credit |
| 5Q05 | Non-qualified credit |