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Integration when no API is available. Is this possible?

Is it possible to integrate with another web app when no API is available? What tools do you recommend?

Context: My users have ERP systems and want my app to communicate with them. The small ERP provider is slow to provide API details.

Example: Activity in my app is complete. I now need to log that activity in the ERP. I can do it manually (similar to logging into a CRM and manually adding sales activity), but want to automate it. With a username and login, can some tool (maybe scraper) input data and press submit buttons to automate this activity?