Get a single Payer Authorisation

<p class="restricted-notice"> Don't use Payer Authorisations for new integrations. It is deprecated in favour of <a href="https://docs.gocardless.com/docs/collect-payments/setting-up-mandates"> Billing Requests</a>. Use Billing Requests to build any future integrations. </p>

Payer Authorisation resource acts as a wrapper for creating customer, bank account and mandate details in a single request. PayerAuthorisation API enables the integrators to build their own custom payment pages.

The process to use the Payer Authorisation API is as follows:

1. Create a Payer Authorisation, either empty or with already available information
2. Update the authorisation with additional information or fix any mistakes
3. Submit the authorisation, after the payer has reviewed their information
4. [coming soon] Redirect the payer to the verification mechanisms from the response of the Submit request (this will be introduced as a non-breaking change)
5. Confirm the authorisation to indicate that the resources can be created

After the Payer Authorisation is confirmed, resources will eventually be created as it's an asynchronous process.

To retrieve the status and ID of the linked resources you can do one of the following:

<ol> <li> Listen to <code> payer_authorisation_completed </code> <a href="https://docs.gocardless.com/docs/api-reference/webhooks"> webhook</a> (recommended)</li> <li> Poll the GET <a href="https://docs.gocardless.com/docs/api-reference/payer-authorisation#get-a-single-payer-authorisation"> endpoint</a></li> <li> Poll the GET events API <code>https://api.gocardless.com/events?payer_authorisation={id}&action=completed</code> </li> </ol> <p class="notice"> Note that the <code>create</code> and <code>update</code> endpoints behave differently than other existing <code>create</code> and <code>update</code> endpoints. The Payer Authorisation is still saved if incomplete data is provided. We return the list of incomplete data in the <code>incomplete_fields</code> along with the resources in the body of the response. The bank account details(account_number, bank_code & branch_code) must be sent together rather than splitting across different request for both <code>create</code> and <code>update</code> endpoints. <br><br> The API is designed to be flexible and allows you to collect information in multiple steps without storing any sensitive data in the browser or in your servers. </p>