Working with Approval Processes and Process Rules | REST API Developer Guide

Get a List of All Approval Processes
Use the *** resource to get information about approvals.

Submit a Record for Approval
Use the *** resource to submit a record or a collection of records for approval. Each call takes an array of requests.

Approve a Record
Use the *** resource to approve a record or a collection of records. Each call takes an array of requests. The current user must be an assigned approver. The contextId is ID of the record to submit for approval..

Reject a Record
Use the *** resource to reject a record or a collection of records. Each call takes an array of requests. The current user must be an assigned approver.

Bulk Approvals
Use the *** resource to do bulk approvals. You can specify a collection of different Process Approvals requests to have them all executed in bulk.

Get a List of Process Rules
Use the *** resource to get information about process rules.

Get a Particular Process Rule
Use the *** resource and specify thesObjectName and workflowRuleId of the rule you want to get the metadata for.

Trigger Process Rules
Use the *** resource to trigger process rules. All rules associated with the specified ID will be evaluated, regardless of the evaluation criteria. All IDs must be for records on the same object.