# Authentication

These endpoints provide various methods for authenticating users from a backend service.

 * **POST** [/auth/signin](/openapi/april-public/authentication/signincustomer/) 
Sign-in from a backend service on behalf of a consumer customer (B2C) or customer delegate (B2B)
* **GET** [/auth/servicetokens/{serviceTokenId}](/openapi/april-public/authentication/getservicetoken/) Return details of a service token
* **GET** [/auth/servicetokens](/openapi/april-public/authentication/queryservicetokens/) Return a paginated list of service tokens
* **POST** [/auth/servicetokens](/openapi/april-public/authentication/createservicetoken/) Create a new service token
* **PATCH** [/auth/servicetokens/{serviceTokenId}](/openapi/april-public/authentication/updateservicetoken/) Various actions for updating a service token


## Sign In Customer

 - [POST /auth/signin](https://docs.meetapril.io/openapi/april-public/openapi/authentication/signincustomer.md): Sign-in from a backend service on behalf of a consumer customer (B2C) or customer delegate (B2B).
Used by custom integrations and e-commerce plugins as a form of single-sign-on for the checkout.
If the customer has been authenticated with the merchant's website, this lets them also authenticate
a known customer with April. This is a pre-requisite for using the checkout for a B2B customer.

For both B2B and B2C customers having an authenticated session with the checkout also unlocks access
to saved cards as a payment source.

Note merchants need to have been registered as supporting B2B customer when onboarded to be able to
support B2B customers in the checkout.

## Get Service Token

 - [GET /auth/servicetokens/{serviceTokenId}](https://docs.meetapril.io/openapi/april-public/openapi/authentication/getservicetoken.md): Return details of a service token.

## Update Service Token

 - [PATCH /auth/servicetokens/{serviceTokenId}](https://docs.meetapril.io/openapi/april-public/openapi/authentication/updateservicetoken.md): Various actions for updating a service token.

## Query Service Tokens

 - [GET /auth/servicetokens](https://docs.meetapril.io/openapi/april-public/openapi/authentication/queryservicetokens.md): Return a paginated list of service tokens.

## Create Service Token

 - [POST /auth/servicetokens](https://docs.meetapril.io/openapi/april-public/openapi/authentication/createservicetoken.md): Create a new service token.