The document discusses lessons learned about driving adoption of APIs in the non-profit sector. It outlines that 3 years ago the sector showed little interest in APIs but that adoption has grown. It then provides 5 lessons: 1) launch your own APIs to validate your methods and learn; 2) pick a major launch partner to validate the APIs; 3) be prepared for a long process of education and iteration; 4) make the APIs easy for others to use; and 5) encourage and celebrate innovation using the APIs. Charts show growing developer accounts and usage of the JustGiving APIs over time.