Instacart, the $2 billion grocery delivery startup that recently announced an extended partnership with Whole Foods, has slashed pay for its drivers and shoppers in major markets like San Francisco and Los Angeles, The Wall Street Journal reported earlier today.

Here’s a nugget from the email, obtained by TechCrunch, that Instacart sent to shoppers in the SF Bay Area:

Instacart is a growing company. From time-to-time, based on order volume, efficiency, and delivery costs, we need to evaluate the rate that we offer shoppers. By making these adjustments, the Instacart community will be better positioned to grow together. Your success is important to us and we recognize that the Instacart community can only be successful if you are successful. We’re working hard to help you fulfill the largest number of orders possible while creating a great experience for customers. These efforts are designed to help you become more efficient and, therefore, earn more.

Instacart notified the shoppers earlier this month, saying that people who collect pre-packed bags from grocery stores will earn $1.50 per drop-off, which represents a 63 percent cut. Previously, drivers made $4 for doing the same task. For full-service shoppers — those who shop and make deliveries — they will make $7.50 per delivery and 25 cents per item collected, or $2.50 per batch, whichever is greater. They will also receive 100% of the tips. Before, full-service shoppers would make $10 per delivery plus half the tips.

“They try to rationalize that you get the tips, but people don’t always tip,” Rita, an Instacart worker in the San Francisco Bay Area, told TechCrunch.

The new payment structure goes into effect Monday, March 14.

“We have made some recent rate changes to reduce variability in how much shoppers earn, and we are constantly innovating to help shoppers get more orders,” Instacart said in a statement to TechCrunch. “After these changes our shoppers will earn, on average, an effective rate of $15 to $20 per hour, which is both in line with historical levels and strongly competitive within our markets.”

Here’s the full text of the email: