# Reference

- [Glossary](/home/connect/overview/glossary.md): Connect API specific terminology that is used throughout this guide
- [Code Reference Tables](/home/connect/overview/code-reference-tables.md)
- [Balance Type Codes](/home/connect/overview/code-reference-tables/balance.md)
- [Credit and Debit Transaction Codes](/home/connect/overview/code-reference-tables/credit-and-debit-code.md)
- [Payment Scheme Codes](/home/connect/overview/code-reference-tables/payment-schemes.md)
- [Direct Debit Scheme Codes](/home/connect/overview/code-reference-tables/direct-debit-scheme.md)
- [Payment Reject Codes](/home/connect/overview/code-reference-tables/payment-reject-codes.md): Codes sent in Transaction-level AddtlInf tag (pain.002.001.10) when payment has been rejected by the scheme or counterparty.
- [Payment Return Codes](/home/connect/overview/code-reference-tables/payment-return-codes.md): Codes that can be used in Instruction for Debtor Agent tag (pain.001.001.09) to initiate return payment.
- [Bacs Direct Debit Mandate Reject Codes](/home/connect/overview/code-reference-tables/bacs-direct-debit-mandate-reject-codes.md)
- [Bacs Direct Debit Reject Codes](/home/connect/overview/code-reference-tables/bacs-direct-debit-reject-codes.md): Inbound Bacs Direct Debit possible statuses and Reject reason codes.
- [Bacs Direct Debit Reversal Reason](/home/connect/overview/code-reference-tables/bacs-direct-debit-reversal-reason.md): Inbound Bacs Direct Debit Reversal possible reason codes.
- [Bank Transaction Codes](/home/connect/overview/code-reference-tables/bank-transaction-codes.md)
- [Transaction Purpose Codes](/home/connect/overview/code-reference-tables/purpose.md): ISO 20022 External Code Set ExternalPurpose1Code
- [Category Purpose Codes](/home/connect/overview/code-reference-tables/category-purpose.md): ISO 20022 External Code Set ExternalCategoryPurpose1Code
- [Private Person Identification Codes](/home/connect/overview/code-reference-tables/private-person-identification.md): ISO 20022 External Code Set ExternalPersonIdentification1Code
- [Organisation Identification Type Codes](/home/connect/overview/code-reference-tables/organisation-identification.md): ISO 20022 External Code Set ExternalOrganisationIdentification1Code
- [Payment Priority Codes](/home/connect/overview/code-reference-tables/payment-priority.md): If payment priority is not provided or faulty, default values will be used.
- [Charges Bearer Codes](/home/connect/overview/code-reference-tables/charges-bearer.md): If not provided or faulty, default values will be used.