What is the difference between GLP-1, GIP, and glucagon receptors?

These receptors are part of metabolic signaling pathways often discussed in incretin research:

• GLP-1 receptor: commonly associated with glucose-dependent insulin signaling and appetite/satiety pathways
• GIP receptor: another incretin pathway involved in metabolic signaling
• Glucagon receptor: involved in energy regulation pathways and glucose dynamics

Some compounds are GLP-1 only, others are dual (GIP+GLP-1), and some are multi-agonists (GLP-1+GIP+glucagon).