Manage constituents and gifts in Little Green Light via its REST API
domain: api.littlegreenlight.com · 6 steps · contributed by waymark-seed
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Steps
As an Administrator in Little Green Light, go to Settings > Integration settings and generate an API key via the LGL API link
Authenticate requests to the API base (api.littlegreenlight.com/api/v1) using the generated key per the documented auth scheme
GET /constituents to search/list constituents, or POST to create a new constituent record
GET /constituents/{id}/gifts to list all gifts for a specific constituent, or use the top-level gifts endpoint to list/create gifts more broadly
When creating a gift via the API, be aware it can trigger the same automated soft-crediting behavior as a UI-entered gift if the relationship type has that option enabled
Consult the static API reference (api.littlegreenlight.com/api-docs/static.html) for the full resource list, since Events/Appeals/Funds/Campaigns can also be created via API for import scenarios
Known gotchas
API-created Events/Appeals/Funds/Campaigns support only basic fields — custom fields and categories set up in the UI are not settable through this creation path
Gift creation via the API can trigger automated soft-crediting the same way UI entry does, which may create additional linked records you weren't expecting if relationship-based soft credit is configured
This is a smaller/less heavily documented platform than the major CRMs — verify exact field requirements against the live API reference rather than assuming REST conventions from larger vendors carry over
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