# Developer Guides

- [System Architecture](/developer-guides/system-architecture.md)
- [API Integration](/developer-guides/api-integration.md)
- [Getting Started](/developer-guides/api-integration/getting-started.md)
- [Postman](/developer-guides/api-integration/postman.md)
- [Authentication](/developer-guides/api-integration/authentication.md)
- [Request Signatures](/developer-guides/api-integration/request-signatures.md)
- [Idempotency](/developer-guides/api-integration/idempotency.md)
- [Blockchain Identifiers](/developer-guides/api-integration/blockchain-identifiers.md)
- [Blockchain Updates](/developer-guides/api-integration/blockchain-updates.md)
- [Sign in With X](/developer-guides/api-integration/sign-in-with-x.md)
- [Fees](/developer-guides/api-integration/fees.md)
- [Simulator](/developer-guides/api-integration/simulator.md)
- [API Reference](/developer-guides/api-integration/api-reference.md)
- [Customers](/developer-guides/api-integration/api-reference/customers.md): API reference for customer-related endpoints
- [Accounts](/developer-guides/api-integration/api-reference/accounts.md): API reference for account-related endpoints
- [Cards](/developer-guides/api-integration/api-reference/cards.md): API reference for card-related endpoints
- [Transactions](/developer-guides/api-integration/api-reference/transactions.md)
- [Webhooks](/developer-guides/api-integration/api-reference/webhooks.md): API reference for webhook-related endpoints
- [Simulator](/developer-guides/api-integration/api-reference/simulator.md)
- [Engine](/developer-guides/api-integration/api-reference/engine.md)
- [States and Transitions](/developer-guides/api-integration/states-and-transitions.md)
- [Customer States](/developer-guides/api-integration/states-and-transitions/customer-states.md)
- [Account States](/developer-guides/api-integration/states-and-transitions/account-states.md)
- [Card States](/developer-guides/api-integration/states-and-transitions/card-states.md)
- [Authorisation States](/developer-guides/api-integration/states-and-transitions/authorisation-states.md)
- [Transaction States](/developer-guides/api-integration/states-and-transitions/transaction-states.md)
- [Smart Contracts](/developer-guides/smart-contracts.md)
- [OffBlocksEscrow.sol](/developer-guides/smart-contracts/offblocksescrow.sol.md): Protocol documentation for the OffBlocksEscrow.sol smart contract.
- [OffBlocksSmartWalletFactory.sol](/developer-guides/smart-contracts/offblockssmartwalletfactory.sol.md): Protocol documentation for the OffBlocksSmartWalletFactory.sol smart contract.
- [OffBlocksSmartWallet.sol](/developer-guides/smart-contracts/offblockssmartwallet.sol.md): Protocol documentation for the OffBlocksSmartWallet.sol smart contract.
- [PendingWithdrawal.sol](/developer-guides/smart-contracts/pendingwithdrawal.sol.md): Protocol documentation for the PendingWithdrawal.sol smart contract.
- [Interfaces](/developer-guides/smart-contracts/interfaces.md)
- [Step-by-step Guide](/developer-guides/step-by-step-guide.md)
- [API Credentials](/developer-guides/step-by-step-guide/api-credentials.md)
- [Authentication](/developer-guides/step-by-step-guide/authentication.md)
- [Request Preparation](/developer-guides/step-by-step-guide/request-preparation.md)
- [Customer Creation](/developer-guides/step-by-step-guide/customer-creation.md)
- [Customer Verification](/developer-guides/step-by-step-guide/customer-verification.md)
- [Account Creation](/developer-guides/step-by-step-guide/account-creation.md)
- [Card Issuance](/developer-guides/step-by-step-guide/card-issuance.md)
- [Card Authorisations](/developer-guides/step-by-step-guide/card-authorisations.md)
- [Webhooks](/developer-guides/step-by-step-guide/webhooks.md)