thanks.io API
Visit https://dashboard.thanks.io/profile/billing to turn on testing mode while testing to automatically cancel all submitted orders. Otherwise you have 1 hour to cancel an order.
thanks.io Embed
Separate from this API, our prebuilt embed widget makes it easy to integrate your CRM with thanks.io and give your clients the ability to send direct mail with minimal effort. Visit https://github.com/thanks-io/thanks.io-embed for more details.
API Tokens
Tokens can be generated on your API Access Page:
https://dashboard.thanks.io/profile/billing
The simplest to use is "Personal Access Tokens" for use as a Bearer Token.

For example, your request will end up looking like,

Image Template Examples
For sample images templates please use these guides:
http://go.thanks.io/imagetemplates
Use Case Examples
For an example of the direct mail thanks.io offers please read our white-paper:
https://www.thanks.io/whitepaper/