I do think that giving the user the idea that this payment method is more secure, reliable and easy would help sell it.
Some thesaurus terms for secure:
assured, at ease, balanced, carefree, cinch, conclusive, confident, determined, easy, established, firm, hopeful, in the bag, locked on, nailed down, on ice, reassured, reliable, resolute, sanguine, self-assured, self-confident, settled, shoo-in, solid, sound, stable, steadfast, steady, strong, sure, sure thing, tried and true, unanxious, undoubtful, well-founded
candid, careful, certain, conscientious, constant, decent, decisive, definite, dependable, determined, devoted, faithful, firm, good, high-principled, honest, honorable, impeccable, incorrupt, loyal, okay, positive, predictable, proved, reputable, respectable, responsible, righteous, safe, sincere, solid, sound, stable, staunch, steadfast, steady, sterling, strong, sure, there, tried, tried-and-true, true, true-blue, true-hearted, trusty, unequivocal, unfailing, unimpeachable, upright, veracious
child's play, cinch*, clean, easy as pie, effortless, elementary, facile, incomplex, intelligible, light, lucid, manageable, mild, no problem, no sweat, not difficult, picnic, piece of cake, plain, quiet, self-explanatory, simple as ABC, smooth, snap*, straightforward, transparent, uncomplicated, uninvolved, unmistakable, untroublesome, walkover