Chase doesn’t care what you buy (even gift cards, prepaid cards, and cash equivalents), bill pay services you use, bank accounts you fund, P2P transfers you make, in order to meet their cards’ MSR.
Amex has much more restrictive language in their terms.
See Amex Updates Terms to Exclude Peer Payments, Cash Equivalents, & Amex GC from Earning Points.
In practice, you can still use a lot of methods that might seem to fall into these restrictive categories to meet an Amex MSR.
Plastiq payments count towards Amex MSRs, provided you can get your payment through Plastiq's restrictive terms for paying with Amex. I use Plastiq all the time to help hit my Amex MSRs.
A few days ago, I noted:
PayPal payments to merchants are fine and count towards Amex MSRs.
PayPal P2P payments to friends & family are fine too and typically don’t pose a problem with counting towards Amex MSR. I’ve made donations to my daughter’s school/pto with my Amex while trying to meet MSR using the friends & family option (to avoid the recipient incurring the fees), and the payments counted towards MSR, with no problem from the RATs.
The only instance I’ve seen Amex RATs have a problem with PayPal P2P payments is when you use PayPal to pay someone who shares the same address as you.
DPs say Venmo payments count towards Amex MSRs too.
You can usually buy third-party/merchant gift cards, prepaid gift cards like Gift of College, Visa and MasterCard gift cards, and have them count towards Amex MSR -- but to be safe, DO NOT BUY THESE FROM RETAILERS THAT PROVIDE AMEX WITH LEVEL 3 DATA. Office supply stores like Staples/Office Depot/Office Max are notorious for sharing L3 data, which discloses everything you bought in your transaction (so if you bought GCs, Amex will be able to see that and could deny you points or not count that spend towards MSR). Grocery stores and home improvement stores like Home Depot and Lowe's, which sell gift cards, generally do not share L3 data. I don't think Walgreens, CVS, Target, or
Walmart share L3 data either.
However, even when merchants don't share L3 data with Amex, what you buy could still be a dead giveaway to Amex that you bought what they may consider cash equivalents. A lot of VGCs, MCGCs, and the GOC GCs have $5.95 activation fees. If you buy only a $500 VGC/MCGC/GOC GC with a $5.95 fee, and the total charge on your statement is $505.95, the Amex RATs don't have to think hard to guess what you bought, and they may not award points for, or count that transaction towards MSR or spending bonuses. So it's advised to throw these cards in with your regular shopping so your charges aren't some obvious amount that flashes gift cards.