The Contributions Dialog API

The Contributions Dialog API allows users to contribute money to support your organization or site.

Create one or more links on your site or your promotional emails with contribution amounts, and the LaterPay Platform will handle the rest.


Our Sales API restricts access to content, in exchange for payment, which requires collecting sales tax. The Contributions API does not collect taxes or restrict access to content; this is a voluntary contribution from the user to you.

The Contributions Dialog API is only available in the US, and is available for merchants not using the Sales API. Please contact if you are interested in using this feature.

Currently LaterPay allows you to create two types of dialogs:

  • Immediate contribution dialog (/dialog/contribute/pay_now) where the user pays their contribution at the same time they pledge it.

  • Later contribution dialog (/dialog/contribute/pay_later) where the user promises to contribute once their invoice reaches a fixed amount.

Common properties

All calls to the following endpoints must include the common parameters (see Common Parameters).

All calls listed here are HTTPS requests to:

Each API call states the HTTP method meant to be used to call it (GET or POST) and its parameters.

All API requests must be signed with a digital signature based on your organization’s API key.