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| Card-present transactions supplement (PDF) | 
| Credit card services user's guide (PDF) | 
| Electronic check services user's guide (PDF) | 
| Level II and level III transactions supplement (PDF) | 
| Merchant descriptors user guide (PDF) | 
| Recurring billing with the business center (PDF) | 
| Recurring billing with the simple order API (PDF) | 
| Reporting user guide (PDF) |