> ## Documentation Index > Fetch the complete documentation index at: https://developers.dwolla.com/llms.txt > Use this file to discover all available pages before exploring further. # Overview > Create, update, remove or retrieve a funding source with the API. Use Finicity, MX, or Flinks via Secure Exchange, Plaid, or micro deposits to verify the funding source. # Funding Sources The Funding Sources resource represents payment accounts that can be used to send and/or receive funds. Funding sources are relational to either a [Dwolla Main Account](/docs/api-reference/accounts/create-a-funding-source-for-an-account) or [Customer](/docs/api-reference/funding-sources/create-customer-funding-source) and can be used to reference details on a payment account. ### Funding source types The three funding source types available with a Dwolla integration include a `bank`, and the Dwolla `balance` account. Type `bank` represents any bank account attached as a funding source to Account and Customer resources. Type `balance` represents the Dwolla Balance made available to Account and Verified Customer resources. ##### Bank funding source Funding sources of type `bank` include an additional attribute, `bankAccountType`, denoting the type of the bank account being attached. The bank account types currently supported by Dwolla include `checking`, `savings`, `general-ledger` and `loan`. * `checking`, `savings` - Checking and savings accounts can be attached to any Customer type. These account types are enabled for all Accounts and Customers, by default. * `general-ledger` - General ledger accounts can only be attached to exempt Business Verified Customers. **Note**: Enabling this account type requires additional Dwolla approvals before getting started. Please contact [Sales](https://www.dwolla.com/contact?b=apidocs) or your account manager for more information on enabling this account type. * `loan` - Loan accounts can only be attached to Verified Customers. These funding-sources can only be credited, meaning funds can only be sent to these accounts. **Note**: Enabling this account type requires additional Dwolla approvals before getting started. Please contact [Sales](https://www.dwolla.com/contact?b=apidocs) or your account manager for more information on enabling this account type. ##### Balance funding source The [Dwolla Balance](/docs/balance-funding-source) can be utilized as a digital "wallet", storing USD funds for the Customer or Account with Dwolla's financial institution partners. Additionally, the Dwolla Balance can be pre-loaded with funds for quicker outgoing ACH transfers to destination funding sources. To get a more in-depth overview of the Dwolla Balance, including functionality and other benefits, check out our [developer resource article](/docs/balance-funding-source) or view our [webinar](https://www.dwolla.com/resources/balance-webinar/). ### Funding source links | Link | Description | | ---------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | self | URL of the funding source resource. | | customer | GET this link to [retrieve details](/docs/api-reference/customers/retrieve-a-customer) of the Customer. | | remove | POST to this link to [remove the funding source](/docs/api-reference/funding-sources/update-or-remove-a-funding-source) from the Customer. | | balance | (Verified Customer only) GET this link to [retrieve the amount available in the balance](/docs/api-reference/funding-sources/retrieve-funding-source-balance) of the Customer's Balance funding source. | | transfer-from-balance | (Verified Customer only) if this link exists, the Customer can transfer funds from their balance. | | transfer-to-balance | (Verified Customer only) if this link exists, funds can be transferred to the Customer's balance. | | transfer-send | If this link exists, the Customer can send funds to another Customer. | | transfer-receive | The Customer can receive funds from another Customer. | | initiate-micro-deposits | POST to this link to [initiate micro-deposits](/docs/api-reference/funding-sources/initiate-or-verify-micro-deposits) on an unverified funding source. | | verify-micro-deposits | Micro-deposits have completed to this funding source and are eligible for verification. POST to this link with the [verify micro-deposit amounts](/docs/api-reference/funding-sources/initiate-or-verify-micro-deposits) and complete bank funding source verification. | | failed-verification-micro-deposits | Micro-deposits attempts have failed due to too many failed attempts. [Remove the bank and re-add to attempt verification again.](/docs/micro-deposit-verification) | ### Funding source resource | Parameter | Description | | ----------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | id | The funding source unique identifier. | | status | Possible values are `unverified` or `verified`. Determines if the funding source has completed verification. | | type | Type of funding source. Possible values are `bank` or `balance`. | | bankAccountType | An attribute for `bank` funding sources that determines the type of account. Possible values are `checking`, `savings`, `general-ledger` or `loan`. | | name | Arbitrary nickname for the funding source. | | created | ISO-8601 timestamp for when the funding source was created. | | balance | An optional object that includes `value` and `currency` parameters. `value` is a string value for the amount available and `currency` is a string value currency code. Only returned for a Dwolla API Customer account balance. | | removed | Determines if the funding source has been [removed](/docs/api-reference/funding-sources/update-or-remove-a-funding-source). A boolean `true` if the funding source was removed or `false` if the funding source is not removed. | | channels | List of processing channels. ACH is the default processing channel for bank transfers. Possible values are `ach`, `real-time-payments` or `wire`. | | bankName | The financial institution name. This value is generated from its routing number by Dwolla when a funding source is created; it cannot be specified manually. | | iavAccountHolders | An optional object that includes optional `selected` and `other` parameters. `selected`, a string with the account holder name(s) on file with the financial institution for the IAV selected account. `other`, a list of strings with name(s) of other accounts on file. Only returned for a Customer that added a bank using Dwolla IAV, and if names are returned for the selected bank account. | | fingerprint | Fingerprint is an optional unique identifying string value returned for funding sources of type `bank`. This attribute can be used to check across all Dwolla API Customers if two bank accounts share the same account number and routing number. Removing a funding source does not remove the `fingerprint`. | #### Funding source resource example ```bash theme={"dark"} { "_links": { "self": { "href": "https://api-sandbox.dwolla.com/funding-sources/fc84223a-609f-42c9-866e-2c98f17ab4fb", "type": "application/vnd.dwolla.v1.hal+json", "resource-type": "funding-source" }, "customer": { "href": "https://api-sandbox.dwolla.com/customers/241ec287-8d7a-4b69-911e-ffbea98d75ce", "type": "application/vnd.dwolla.v1.hal+json", "resource-type": "customer" } }, "id": "fc84223a-609f-42c9-866e-2c98f17ab4fb", "status": "verified", "type": "bank", "bankAccountType": "checking", "name": "Your Account #1 - CHECKING", "created": "2017-08-16T20:06:34.000Z", "removed": false, "channels": [ "ach", "real-time-payments" ], "bankName": "SANDBOX TEST BANK", "iavAccountHolders": { "selected": "account holder", "other": [ "Jane Doe", "GeneriCompany LLC" ] }, "fingerprint": "4cf31392f678cb26c62b75096e1a09d4465a801798b3d5c3729de44a4f54c794" } ```