# Join program Enrol the authenticated user in this program's default tier. If the user is already enrolled in a different program they will leave it before joining this one. Re-joining a program the user is already in returns the same program unchanged. Returns `404` if the program does not exist or has no default tier configured. Endpoint: POST /programs/{program_id}/join Version: 2.0 Security: oauth2 ## Path parameters: - `program_id` (string, required) The ID of the specific Program to retrieve. ## Header parameters: - `EvEnergy-Version` (number) Specify the version of this endpoint to use. - `EvEnergy-User` (string) If the client is authenticated using Client Credentials, setting EvEnergy-User to a valid user ID allows requests to be made as if you were directly authenticated as that user. ## Response 201 fields (application/json): - `id` (string) Example: prog01JCK1HPNAANB8WN253G27SFPC - `url` (string) Example: https://api.ev.energy/v2/programs/prog01JCK1HPNAANB8WN253G27SFPC - `name` (string) A human-friendly name for the Program. Example: CoolCharge - `description` (string) A plain text description of the program's incentives and requirements. Example: A program which incentivises charging when it's coolest to charge your EV - `logo` (string | null) URL to download a logo image for the Program. - `sponsor_name` (string) The name of the organisation which sponsors the program. Often, but not always, a utility company. Example: Cool Power - `external_url` (string) A publicly accessible URL where individuals can enroll in the program. Example: https://www.example.com/coolcharge - `sign_up_url` (string | null) URL of the registration form for this specific program, where one exists. Example: https://www.example.com/coolcharge/sign-up - `eligibility_criteria` (string | null) HTML description of who is eligible to join the program. Example:

Residential customers of Cool Power with a compatible EV or home charger.

- `benefits` (string | null) HTML description of the benefits of joining the program. Example:

Earn a monthly bill credit for charging off-peak.

- `country` (string) ISO 3166-1 alpha-2 code of the country the program operates in. Example: US - `faqs_url` (string | null) URL of the program's FAQ page, where one exists. Example: https://www.example.com/coolcharge/faqs - `support_email` (string) Customer support email address for this program. Example: support@ev.energy - `payment_frequency` (string | null) How often incentive payments are made, where the program pays incentives. Enum: "WEEKLY", "MONTHLY", "QUARTERLY", null - `payment_day_of_month` (integer | null) Day of the month incentive payments are made, for monthly or quarterly programs. 31 means the last day of the month. Null when the program has no payment day configured. Example: 15 - `payment_weekday` (string | null) Day of the week incentive payments are made, for weekly programs. Null when the program has no payment weekday configured. Enum: "MON", "TUE", "WED", "THU", "FRI", "SAT", "SUN", null - `hidden` (boolean) Whether the program is hidden from public program lists. Hidden programs (test, internal, ended or mothballed) are omitted from the list endpoint for anonymous and driver-scoped requests, but are still returned by ID and are always listed for organisation-scoped API clients. Example: false ## Response 400 fields (application/problem+json): - `type` (string) Example: https://api.ev.energy/v2/problems/example-problem/ - `status` (number) Example: 400 - `title` (string, required) Example: Short description - `detail` (string, required) Example: Long, more specific description. - `instance` (string) Example: https://api.ev.energy/v2/users/user01HN2P75GBNFRJPCZJXEFVXH5E - `notification` (object) Something that the user should be informed about. - `notification.id` (string, required) Unique identifier for the Notification Example: notf67O36PLTFDB57M0E5L33JZLGM0 - `notification.url` (string, required) Example: https://api.ev.energy/notifications/notf67O36PLTFDB57M0E5L33JZLGM0 - `notification.message_id` (string, required) Internal identifier for this notification type. E.g. 'ERR0023' - `notification.category` (string, required) Category of this notification type Enum: "ACTIONABLE", "SERVICE", "RETRY", "MARKETING", "INTERNAL" - `notification.event_time` (string, required) The timestamp of the event described by this notification - `notification.short_text_title` (string, required) Short title for the notification - `notification.short_text_body` (string, required) Short description of the event being notified - `notification.detail_page_title` (string, required) Title of a help page giving more information about this notification - `notification.detail_page_body` (string, required) Text of a help page giving more information about this notification - `notification.external_link` (string | null, required) URL of a web page giving further information about this notification - `notification.external_button_label` (string, required) Text to be displayed on a button leading to the external_link location - `notification.read_at` (string) When the user examined the contents of this notification - `notification.resolved_at` (string) When the problem associated with this notification was resolved ## Response 401 fields (application/problem+json): - `status` (number) Example: 401 - `title` (string, required) Example: Unauthorized - `detail` (string, required) Example: Authentication credentials were not provided. ## Response 403 fields (application/problem+json): - `status` (number) Example: 403 - `title` (string, required) Example: Forbidden - `detail` (string, required) Example: You do not have permission to perform this action. ## Response 404 fields (application/problem+json): - `status` (number) Example: 404 - `title` (string, required) Example: Not found - `detail` (string, required) Example: Resource does not exist or cannot be accessed. ## Response 406 fields (application/problem+json): - `status` (number) Example: 406 - `title` (string, required) Example: Not Acceptable - `detail` (string, required) Example: Could not satisfy the request Accept header. ## Response 429 fields (application/problem+json): - `type` (string) Example: https://api.ev.energy/v2/problems/example-problem/ - `status` (number) Example: 400 - `title` (string, required) Example: Short description - `detail` (string, required) Example: Long, more specific description. - `instance` (string) Example: https://api.ev.energy/v2/users/user01HN2P75GBNFRJPCZJXEFVXH5E - `notification` (object) Something that the user should be informed about. - `notification.id` (string, required) Unique identifier for the Notification Example: notf67O36PLTFDB57M0E5L33JZLGM0 - `notification.url` (string, required) Example: https://api.ev.energy/notifications/notf67O36PLTFDB57M0E5L33JZLGM0 - `notification.message_id` (string, required) Internal identifier for this notification type. E.g. 'ERR0023' - `notification.category` (string, required) Category of this notification type Enum: "ACTIONABLE", "SERVICE", "RETRY", "MARKETING", "INTERNAL" - `notification.event_time` (string, required) The timestamp of the event described by this notification - `notification.short_text_title` (string, required) Short title for the notification - `notification.short_text_body` (string, required) Short description of the event being notified - `notification.detail_page_title` (string, required) Title of a help page giving more information about this notification - `notification.detail_page_body` (string, required) Text of a help page giving more information about this notification - `notification.external_link` (string | null, required) URL of a web page giving further information about this notification - `notification.external_button_label` (string, required) Text to be displayed on a button leading to the external_link location - `notification.read_at` (string) When the user examined the contents of this notification - `notification.resolved_at` (string) When the problem associated with this notification was resolved